Poynting vector for an electron Magnetic wave is equal to

by

1 Answer

Answer :

Poynting vector for an electron Magnetic wave is equal to E x H.

by

Related questions

The Poynting vector is the power component that is calculated by the a) Product of E and H b) Ratio of E and H c) Dot product of E and H d) Cross product of E and H

Description : The Poynting vector is the power component that is calculated by the a) Product of E and H b) Ratio of E and H c) Dot product of E and H d) Cross product of E and H

Last Answer : d) Cross product of E and H

Poynting vector wattmeter is based on

Description : Poynting vector wattmeter is based on   (A) Seebeck effect (B) Ferranti effect (C) Induction effect (D) Hall effect

Last Answer : Poynting vector wattmeter is based on Induction effect 

What does the Poynting vector represent ?

Description : What does the Poynting vector represent ?  (A) Electromagnetic fields (B) Power density (C) Power (D) Energy

Last Answer : The Poynting vector represent  Power density

What determines antenna polarization? A. The frequency of the radiated wave B. The direction of the radiated wave C. The direction of the magnetic field vector D. The direction of the electric field vector

Description : What determines antenna polarization? A. The frequency of the radiated wave B. The direction of the radiated wave C. The direction of the magnetic field vector D. The direction of the electric field vector

Last Answer : D. The direction of the electric field vector

An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then

Description : An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then

Last Answer : An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then A. ... D. path of both will be straight line

The vectors of the electromagnetic wave propagation can be expressed in a) Dot product b) Cross product c) Unit vector d) Perpendicular vector

Description : The vectors of the electromagnetic wave propagation can be expressed in a) Dot product b) Cross product c) Unit vector d) Perpendicular vector

Last Answer : b) Cross product

Pick up the correct statement from the following: (A) When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed (B) When the electric vector is in the plane of incidence, vertical polarisation is formed (C) When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed (D) All of these

Description : Pick up the correct statement from the following: (A) When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed (B) When the electric vector is ... right angles to the plane of incidence, horizontal polarization wave is formed (D) All of these

Last Answer : Answer: Option D

A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic vector field ` vec(B)` at a point havin

Description : A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic vector field ` vec(B)` at a point havin

Last Answer : A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic ... -yhat(j)))/(2pi(x^(2)+y^(2)))`

Magnetic dipole moment is a vector quantity directed from which direction?

Description : Magnetic dipole moment is a vector quantity directed from which direction?

Last Answer : South to north

The gradient of the magnetic vector potential can be expressed as a) –με dV/dt b) +με dE/dt c) –με dA/dt d) +με dB/dt

Description : The gradient of the magnetic vector potential can be expressed as a) –με dV/dt b) +με dE/dt c) –με dA/dt d) +με dB/dt

Last Answer : a) –με dV/dt

The magnitude of the conduction current density for a magnetic field intensity of a vector yi + zj + xk will be a) 1.414 b) 1.732 c) -1.414 d) -1.732

Description : The magnitude of the conduction current density for a magnetic field intensity of a vector yi + zj + xk will be a) 1.414 b) 1.732 c) -1.414 d) -1.732

Last Answer : b) 1.732

Find the magnetic flux density when the vector potential is a position vector. a) 1 b) 0 c) -1 d) ∞

Description : Find the magnetic flux density when the vector potential is a position vector. a) 1 b) 0 c) -1 d) ∞

Last Answer : b) 0

Find the magnetic field when the magnetic vector potential is a unit vector. a) 1 b) -1 c) 0 d) 2

Description : Find the magnetic field when the magnetic vector potential is a unit vector. a) 1 b) -1 c) 0 d) 2

Last Answer : c) 0

The current element of the magnetic vector potential for a surface current will be a) J dS b) I dL c) K dS d) J dV

Description : The current element of the magnetic vector potential for a surface current will be a) J dS b) I dL c) K dS d) J dV

Last Answer : c) K dS

The magnetic vector potential for a line current will be inversely proportional to a) dL b) I c) J d) R

Description : The magnetic vector potential for a line current will be inversely proportional to a) dL b) I c) J d) R

Last Answer : d) R

The Laplacian of the magnetic vector potential will be a) –μ J b) – μ I c) –μ B d) –μ H

Description : The Laplacian of the magnetic vector potential will be a) –μ J b) – μ I c) –μ B d) –μ H

Last Answer : a) –μ J

Find the magnetic field intensity when the magnetic vector potential x i + 2y j + 3z k. a) 6 b) -6 c) 0 d) 1

Description : Find the magnetic field intensity when the magnetic vector potential x i + 2y j + 3z k. a) 6 b) -6 c) 0 d) 1

Last Answer : b) -6

The magnetic vector potential is a scalar quantity. a) True b) False

Description : The magnetic vector potential is a scalar quantity. a) True b) False

Last Answer : b) False

Find the magnetic flux density of the material with magnetic vector potential A = y i + z j + x k. a) i + j + k b) –i – j – k c) –i-j d) –i-k

Description : Find the magnetic flux density of the material with magnetic vector potential A = y i + z j + x k. a) i + j + k b) –i – j – k c) –i-j d) –i-k

Last Answer : b) –i – j – k

Which of the following is a vector quantity ? (a) Relative permeability (b) Magnetic field intensity (c) Flux density (d) Magnetic potential

Description : Which of the following is a vector quantity ? (a) Relative permeability (b) Magnetic field intensity (c) Flux density (d) Magnetic potential

Last Answer : (b) Magnetic field intensity

Which of the following statements are true? i) reactive current is necessary to build up the flux for the magnetic field of inductive devices ii) some portion of reactive current is converted into work iii) the cosine of angle between kVA and kVAr vector is called power factor iv) the cosine of angle between kW and kVA vector is called power factor a) i & iv b) ii & iii c) i & iii d) iii & iv

Description : Which of the following statements are true? i) reactive current is necessary to build up the flux for the magnetic field of inductive devices ii) some portion of reactive current is converted into work iii) the cosine of angle ... called power factor a) i & iv b) ii & iii c) i & iii d) iii & iv

Last Answer : a) i & iv

1. Who was the first General-Secretary of the Indian National Congress? 2. Which first Bank was established in India? 3. Magnetic dipole moment is a vector quantity directed from which direction? 4. How much distance does the earth’s annual circuit round the sun cover? 5. Which animal had the Stone Age people first?

Description : 1. Who was the first General-Secretary of the Indian National Congress? 2. Which first Bank was established in India? 3. Magnetic dipole moment is a vector quantity directed from which direction? 4. How much ... 19. Which is the largest river in the world? 20. Who was known as 'Andhra Bhoja'?

Last Answer : Answer : 1. Dadabhai Naoroji 2. Bank of Hindustan 3. South to north 4. 966 million kms 5. Sheep 6. Nitrogen 7. Constitution of Canada 8. Dr. Neelam Sanjiva Reddy 9. The horse latitude 10. ... . Kharoshti 16. 69th Amendment 17. Preparation of the plan 18. September 19 19. Amazon 20. Krishnadeva Raya

Which of the following particles has the dual nature of particle-wave? (1) Electron (2) Meson (3) Proton (4) Neutron

Description : Which of the following particles has the dual nature of particle-wave? (1) Electron (2) Meson (3) Proton (4) Neutron

Last Answer : (1) Electron

The wave nature of electron was sug- gested by whom?

Description : The wave nature of electron was sug- gested by whom?

Last Answer : Louis De Broglie

What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?

Description : What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?

Last Answer : The traveling wave must have a forward velocity equal to or less than the speed of the electrons in the beam.

Which of the following particles has the dual nature of particle– wave? (1) Electron (2) Meson (3) Proton (4) Neutron

Description : Which of the following particles has the dual nature of particle– wave? (1) Electron (2) Meson (3) Proton (4) Neutron

Last Answer : Electron

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to

Description :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Last Answer :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

An elliptically (arbitrarily polarized wave c an be broken up into

Description : An elliptically (arbitrarily polarized wave c an be broken up into  a) Two circularly polarized components rotating in same direction b) Two circularly polarized components rotating in opposite directions c) Two stationary circularly polarized components d) None of these

Last Answer : An elliptically (arbitrarily polarized wave c an be broken up into Two circularly polarized components rotating in opposite directions 

In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is:

Description : In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: (1) 50 Hz (2) 100 Hz (3) 150 Hz (4) 200 Hz

Last Answer : In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: 100 Hz

In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary

Description : In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is: (1) 30 V (2) 60 V (3) 15 V (4) 10 V

Last Answer : In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is: 60 V

The phase angle corresponding to λ/4 in a standing– wave pattern is:

Description : The phase angle corresponding to λ/4 in a standing– wave pattern is: (1) 30° (2) 90° (3) 135° (4) 180°

Last Answer : The phase angle corresponding to λ/4 in a standing– wave pattern is: 90°

A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its

Description : A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is: (1) 0° (2) 30° (3) 45° (4) 60°

Last Answer : A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is:60°

The transient current in lossless L-C circuit when excited from an AC source is, sine wave

Description : The transient current in lossless L-C circuit when excited from an AC source is, sine wave  (a) Critically damped (b) Underdamped (c) Overdamped (d) Undamped

Last Answer : The transient current in lossless L-C circuit when excited from an AC source is, sine wave Undamped

The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc

Description : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be • 12.1 volt • 1.21 volt • 0.482 volt • 4.82 volt

Last Answer : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be 12.1 volt

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output?

Description : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Last Answer : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

A quarter wave line open circuited at far end behaves as:

Description : A quarter wave line open circuited at far end behaves as:  (1) Inductance (2) L and C in parallel (3) Capacitance (4) L and C in series

Last Answer : A quarter wave line open circuited at far end behaves as: L and C in series.

Rectification efficiency of a full wave rectifier without filter is nearly equals to:

Description : Rectification efficiency of a full wave rectifier without filter is nearly equals to:  (1) 51% (2) 61% (3) 71% (4) 81%

Last Answer : Rectification efficiency of a fullwave rectifier without filter is nearly equals to: 81%

The phase velocity of wave propagating in a hollow metal wave guide is:...

Description : The phase velocity of wave propagating in a hollow metal wave guide is:  (1) Greater than the velocity of the light in free space (2) Less than the velocity of the light in free space (3) Equal to the velocity of the light in free space (4) Equal to the group velocity

Last Answer : The phase velocity of wave propagating in a hollow metal wave guide is Greater than the velocity of the light in free space.

Ripple factor for a half wave rectifier is ....

Description : Ripple factor for a half wave rectifier is  a. 1.65 b. 1.45 c. 1 d. 1.21 

Last Answer : Ripple factor for a half wave rectifier is 1.21

The polarization required in ground wave propagation is

Last Answer : The polarization required in ground wave propagation is vertical (linear).

In AM wave, useful power is carried by - - -

Last Answer : In AM wave, useful power is carried by Side bands

A circuit that generates square wave is called - - -

Last Answer :  A circuit that generates square wave is called Multi vibrators

The velocity of the wave as it passes from air into ionosphere

Last Answer : The velocity of the wave as it passes from air into ionosphere Increases.

10. Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field? -Science

Description : 10. Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field? -Science

Last Answer : The direction of the magnetic field can be determined using the Fleming’s Left hand rule. The direction of the magnetic field will be perpendicular to the direction of current and the direction ... it can be concluded that the direction of the magnetic field inside the chamber is downward.

An electron starting at angle `alpha=60^(@)` with a uniform magnetic induction `B=0.1 T` moves with velocity `v=10^(6) m s^(-1)`. A screen is held at

Description : An electron starting at angle `alpha=60^(@)` with a uniform magnetic induction `B=0.1 T` moves with velocity `v=10^(6) m s^(-1)`. A screen is held at

Last Answer : An electron starting at angle `alpha=60^(@)` with a uniform magnetic induction `B=0.1 T` ... to the point on the screen where the electron strikes.

A nonrelativistic electron enters a uniform magnetic field of 50 mT with a speed of `10^(6) m//s` at right angles to it and emerges from the field aft

Description : A nonrelativistic electron enters a uniform magnetic field of 50 mT with a speed of `10^(6) m//s` at right angles to it and emerges from the field aft

Last Answer : A nonrelativistic electron enters a uniform magnetic field of 50 mT with a speed of `10^(6) m/ ... not depend on the initial speed of the electron.

Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is

Description : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is

Last Answer : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^ ... C//kg`. The radius of the circular path will be

An electron of energy 150 eV describes a circle in a magnetic field of 0.1 tesla. Calculate the radius of the curcle.

Description : An electron of energy 150 eV describes a circle in a magnetic field of 0.1 tesla. Calculate the radius of the curcle.

Last Answer : An electron of energy 150 eV describes a circle in a magnetic field of 0.1 tesla. Calculate the radius of the curcle.

When an electronl beam passes through and electric field they gain kinetic energy. If the same electron beam passes through a magnetic field then thei

Description : When an electronl beam passes through and electric field they gain kinetic energy. If the same electron beam passes through a magnetic field then thei

Last Answer : When an electronl beam passes through and electric field they gain kinetic energy. If the same ... C. momentum increases D. kinetic energy increases

An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude

Description : An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude

Last Answer : An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at ... (r)` D. `(mu_(0)"ne")/(2r)`