Description : The magnetic flux density is directly proportional to the magnetic field intensity. State True/False. a) True b) False
Last Answer : a) True
Description : If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is A. thrice the Earth's magnetic flux density B. four times the Earth ... C. five times the Earth's magnetic flux density D. twice the Earth's magnetic flux density
Last Answer : twice the Earth's magnetic flux density
Description : Magnitude of induced e.m.f is proportional to A. rate of change of current B. rate of change of voltage C. rate of change of magnetic flux linkage D. rate of change of resistance
Last Answer : rate of change of magnetic flux linkage
Description : Total number of magnetic field lines passing through an area is called A. magnetic flux density B. magnetic flux C. e.m.f D. voltage
Last Answer : magnetic flux
Description : Which quantity is solenoidal in the electromagnetic theory? a) Electric field intensity b) Electric flux density c) Magnetic field intensit d) Magnetic flux density
Last Answer : d) Magnetic flux density
Description : Electric field strength related to hall voltage is given by A. VHd B. VH⁄d C. VHE D. Ed
Last Answer : VH⁄d
Description : The rotor of a synchronous motor operates in synchronism with the rotating field because ______________. A. of the amortisseur windings B. the rotor is magnetically locked into step with the ... field strength varies directly with rotor slip D. the stator flux rotates in the opposite direction
Last Answer : Answer: B
Description : Strength of magnetic field is known as A. flux B. density C. magnetic strength D. magnetic flux density
Last Answer : magnetic strength
Description : A straight wire of length 0.20 m moves at a steady speed of 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is A. 0.5 V B. 0.06 V C. 0.05 V D. 0.04 V
Last Answer : 0.06 V
Description : Force on a moving charge in a uniform magnetic field depends uponA. magnetic flux density B. the charge on the particle C. the speed of particle D. all of above
Last Answer : all of above
Description : An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm
Last Answer : 3.8 cm
Description : The line integral of the magnetic field intensity is the a) Current density b) Current c) Magnetic flux density d) Magnetic moment
Last Answer : b) Current
Description : If the magnetic flux density and current are at right angles, then component of force acting on the conductor is A. BIL cosθ B. BIL sinθ C. BIL tanθ D. BL sinθ
Last Answer : BIL sinθ
Description : For a straight wire, induced current depends uponA. the speed of movement of wire B. the length of wire C. the magnitude of magnetic flux density D. all of above
Description : Whenever there is force on magnetic pole, there exists A. magnetic field B. electric field C. current D. voltage
Last Answer : electric field
Description : In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage
Description : 27] In a transformer, the leakage flux of each winding is proportional to the current in that winding because A. Ohm's law applies to magnetic circuits B. Leakage paths do no saturate C. the two windings are electrically isolated D. mutual flux is confined to the core
Last Answer : B. Leakage path do not saturate
Description : The Tesla and the Gauss are units of measure of: w) conductance x) magnetic field strength y) magnetic flux z) electrical current
Last Answer : ANSWER: X -- MAGNETIC FIELD STRENGTH
Description : Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is A. inversely proportional to the square of the distance from the center of the Earth ... center of the Earth D. directly proportional to the distance from the center of the Earth
Last Answer : directly proportional to the distance from the center of the Earth
Description : Find the magnetic field intensity of a material with flux density of 24 units in air(in 10 6 order) a) 19.09 b) 21 c) 25 d) 26.78
Last Answer : a) 19.09
Description : Given the magnetic field is 2.4 units. Find the flux density in air(in 10 -6 order). a) 2 b) 3 c) 4 d) 5
Last Answer : b) 3
Description : Pick up the correct statement from the following: (A) Permeability is a measure of conducting the magnetic lines of force in the material (B) Permeability is a measure of the extent to which magnetic ... magnetic flux density (B) to the field strength of the magnetizing field (D) All of these
Last Answer : Answer: Option D
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
Description : In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (A) Increased (B) Decreased (C) Remains unchanged (D) Becomes zero
Last Answer : (C) Remains unchanged
Description : If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: A. increases B. decreases C. remains the same D. doubles
Last Answer : If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: decreases
Description : How does the electric field strength of a standard broadcast station vary with the distance from the antenna? A. The field strength of a standard broadcast station vary with the distance from ... the distance from the antenna D. The field strength varies inversely as the distance from the antenna
Last Answer : D. The field strength varies inversely as the distance from the antenna
Description : E.M.F for a coil depends upon A. the cross sectional area B. no. of turns of wire C. the magnitude of magnetic flux density D. all of above
Description : E.M.F can be induced in a circuit by A. changing magnetic flux density B. changing area of circuit C. changing the angle D. all of above
Description : An advantage of optic fiber rejecting an induced noise signals from magnetic field or solar storms flux. A. Electric hazard B. Cross talk C. Immunity to noise D. Shielding
Last Answer : C. Immunity to noise
Description : Find the electric field applied on a system with electrons having a velocity 5m/s subjected to a magnetic flux of 3.6 units. a) 15 b) 18 c) 1.38 d) 0.72
Last Answer : b) 18
Description : In motor a permanent magnet provides: a. Electric field b. electric flux c. magnetic field d. gravitational field
Last Answer : d. gravitational field
Description : The space around the charge within which other charges are influenced by it is called: (a) Electric field (b) Magnetic field (c) Electric flux (d) Electric intensity
Last Answer : a) Electric field
Description : The charge density of a field with a position vector as electric flux density is given by a) 0 b) 1 c) 2 d) 3
Last Answer : d) 3
Description : The electric field intensity of a field with velocity 10m/s and flux density of 2.8 units is a) 0.28 b) 28 c) 280 d) 10/2.8
Last Answer : b) 28
Description : Find the electric field when the velocity of the field is 12m/s and the flux density is 8.75 units. a) 510 b) 105 c) 150 d) 165
Last Answer : b) 105
Description : If the electric potential is given, which of the following cannot be calculated? a) Electrostatic energy b) Electric field intensity c) Electric flux density d) Permittivity
Last Answer : a) Electrostatic energy
Description : Calculate the energy in an electric field with flux density 6 units and field intensity of 4 units. a) 12 b) 24 c) 36 d) 48
Last Answer : a) 12
Description : Find the electric flux density surrounding a material with field intensity of 2xyz placed in transformer oil ( εr = 2.2) at the point P(1,2,3) is (in 10 -10 units) a) 2.1 b) 2.33 c) 2.5 d) 2.77
Last Answer : c) 2.5
Description : The electric flux density and electric field intensity have which of the following relation? a) Linear b) Nonlinear c) Inversely linear d) Inversely nonlinear
Last Answer : a) Linear
Description : Gauss law cannot be used to find which of the following quantity? a) Electric field intensity b) Electric flux density c) Charge d) Permittivity
Last Answer : d) Permittivity
Description : Which of the following correctly states Gauss law? a) Electric flux is equal to charge b) Electric flux per unit volume is equal to charge c) Electric field is equal to charge density d) Electric flux per unit volume is equal to volume charge density
Last Answer : d) Electric flux per unit volume is equal to volume charge density
Description : The electric flux density is the a) Product of permittivity and electric field intensity b) Product of number of flux lines and permittivity c) Product of permeability and electric field intensity d) Product of number of flux lines and permeability
Last Answer : a) Product of permittivity and electric field intensity
Description : Electric flux density in electric field is referred to as a) Number of flux lines b) Ratio of flux lines crossing a surface and the surface area c) Direction of flux at a point d) Flux lines per unit area
Last Answer : b) Ratio of flux lines crossing a surface and the surface area
Description : . In magnetic flow meters, voltage generation is (A) Due to the motion of conducting fluid through an externally generated uniform field (B) Proportional to the fluid velocity (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : A multimeter can be used to directly measure _____________. A. watts B. field flux C. current D. all of the above
Last Answer : Answer: C
Description : A synchronous motor maintains synchronism with the rotating field because _____________. A. field strength varies directly with rotor slip B. DC current applied to the rotor coils causes the rotor ... the flux created by the excitation current D. the stator flux rotates in the opposite direction
Description : Which physical quantity is measured in ‘siemens’? (1) Electric potential (2) Electrical conductance (3) Magnetic flux (4) Refractive index
Last Answer : (2) Electrical conductance Explanation: The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).
Description : About trnsformer
Last Answer : Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer
Description : Find the Lorentz force due to a conductor of length 2m carrying a current of 1.5A and magnetic flux density of 12 units. a) 24 b) 36 c) 32 d) 45
Last Answer : c) 32
Description : Find the magnetic flux density of a finite length conductor of radius 12cm and current 3A in air( in 10 -6 order) a) 4 b) 5 c) 6 d) 7
Last Answer : b) 5