Two charges 1C and -4C exists in air. What is the direction of force?
a) Away from 1C
b) Away from -4C
c) From 1C to -4C
d) From -4C to 1C

1 Answer

Answer :

c) From 1C to -4C

Related questions

Description : Find the electric field intensity of two charges 2C and -1C separated by a distance 1m in air. a) 18 X 10 9 b) 9 X 10 9 c) 36 X 10 9 d) -18 X 10 9

Last Answer : b) 9 X 10 9

Description : Find the force between 2C and -1C separated by a distance 1m in air(in newton). a) 18 X 10 6 b) -18 X 10 6 c) 18 X 10 -6 d) -18 X 10 -6

Last Answer : b) -18 X 10 6

Description : Calculate the distance between two charges of 4C forming a dipole, with a dipole moment of 6 units. a) 1 b) 1.5 c) 2 d) 2.5

Last Answer : b) 1.5

Description : Charges filled inside a cylindrical will possess flux in which direction? a) Upwards b) Downwards c) Laterally outwards d) Inwards

Last Answer : c) Laterally outwards

Description : Find the force between two charges when they are brought in contact and separated by 4cm apart, charges are 2nC and -1nC, in μN. a) 1.44 b) 2.44 c) 1.404 d) 2.404

Last Answer : c) 1.404

Description : A charge of 2 X 10 -7 C is acted upon by a force of 0.1N. Determine the distance to the other charge of 4.5 X 10 -7 C, both the charges are in vacuum. a) 0.03 b) 0.05 c) 0.07 d) 0.09

Last Answer : d) 0.09

Description : Find the force that exists in an electromagnetic wave. a) Electrostatic force b) Magnetostatic force c) Lorentz force d) Electromotive force

Last Answer : c) Lorentz force

Description : When currents are moving in the same direction in two conductors, then the force will be a) Attractive b) Repulsive c) Retracting\ d) Opposing

Last Answer : a) Attractive

Description : The lines of force are said to be a) Real b) Imaginary c) Drawn to trace the direction d) Not significant

Last Answer : c) Drawn to trace the direction

Description : The potential due to the dipole on the midpoint of the two charges will be a) 0 b) Unity c) ∞ d) -∞

Last Answer : a) 0

Description : For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be a) 5.91 b) 12.6 c) 2 d) 9

Last Answer : a) 5.91

Description : Find the potential due the dipole when the angle subtended by the two charges at the point P is perpendicular. a) 0 b) Unity c) ∞ d) -∞

Last Answer : a) 0

Description : The inductance is the measure of a) Electric charges stored by the material b) Emf generated by energising the coil c) Magnetic field stored by the material d) Magnetization of dipoles

Last Answer : c) Magnetic field stored by the material

Description : Identify the advantage of using method of images. a) Easy approach b) Boundaries are replaced by charges c) Boundaries are replaced by images d) Calculation using Poisson and Laplace equation

Last Answer : a) Easy approach

Description : Which of the following properties distinguish a material as conductor, insulator and semiconductor? a) Free electron charges b) Fermi level after doping c) Energy band gap d) Electron density

Last Answer : c) Energy band gap

Description : The electrostatic energy in an electric field does not depend on which of the following? a) Magnitude of charges b) Permittivity c) Applied electric field d) Flux lines

Last Answer : c) Applied electric field

Description : Calculate the dipole moment of a dipole with equal charges 2C and -2C separated by a distance of 2cm. a) 0.02 b) 0.04 c) 0.06 d) 0.08

Last Answer : b) 0.04

Description : The potential due to a dipole at a point P from it is the a) Sum of potentials at the charges b) Difference of potentials at the charges c) Multiplication of potentials at the charges d) Ratio of potentials at the charges

Last Answer : b) Difference of potentials at the charges

Description : Choose the best definition of a dipole. a) A pair of equal and like charges located at the origin b) A pair of unequal and like charges located at the origin c) A pair of equal and unlike charges separated by a small distance d) A pair of unequal and unlike charges separated by a small distance

Last Answer : c) A pair of equal and unlike charges separated by a small distance

Description : Six equal point charges Q = 10nC are located at 2,3,4,5,6,7m. Find the potential at origin. a) 140.35 b) 141.35 c) 142.35 d) 143.35

Last Answer : d) 143.35

Description : In the given types of polarisation, which type exists in the semiconductor? a) Electronic b) Ionic c) Orientational d) Interfacial or space charge

Last Answer : d) Interfacial or space charge

Description : The force per unit length of two conductors carrying equal currents of 5A separated by a distance of 20cm in air(in 10 -6 order) a) 25 b) 35 c) 40 d) 50

Last Answer : a) 25

Description : The resultant electric field of two components in the x and y direction having amplitudes 6 and 8 respectively is a) 100 b) 36 c) 64 d) 10

Last Answer : d) 10

Description : For dielectrics, which two components will be in phase? a) E and wave direction b) H and wave direction c) Wave direction and E x H d) E and H

Last Answer : d) E and H

Description : What is the answer. There are three identical metal spheres labeled A, B and A has a charge of 1C while B and Care neutral. If A touches B and then is removed, and then B touches C and is removed what is the charge on C?

Last Answer : C are***

Description : What does 1C mean ?

Last Answer : When one ampere ( 1A) flows through a conductor for one second ( 1s) , the amount of charge flowing through any of its cross sections is called one coulomb ( 1C) .

Description : If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be a. 3600C b. 7200C c. 1C d. 2C

Last Answer : a. 3600C

Description : The torque of a conductor is defined only in the case when a) The field is perpendicular to the loop b) The plane of the loop is parallel to the field c) The plane of the loop is perpendicular to the current direction d) The field and the current direction are same

Last Answer : b) The plane of the loop is parallel to the field

Description : When the electric field travels in +x direction and the EM wave is travelling the –y direction, then the magnetic field will be travelling in which direction? a) +z direction b) –z direction c) Either +z or –z direction d) Does not trave

Last Answer : c) Either +z or –z direction

Description : Find the magnetic field intensity due to an infinite sheet of current 5A and charge density of 12j units in the positive y direction and the z component is below the sheet. a) 6 b) 0 c) -6 d) 60k

Last Answer : c) -6

Description : Find the magnetic field intensity due to an infinite sheet of current 5A and charge density of 12j units in the positive y direction and the z component is above the sheet. a) -6 b) 12k c) 60 d) 6

Last Answer : d) 6

Description : In isotropic materials, which of the following quantities will be independent of the direction? a) Permittivity b) Permeability c) Polarisation d) Polarizability

Last Answer : a) Permittivity

Description : The best definition of polarisation is a) Orientation of dipoles in random direction b) Electric dipole moment per unit volume c) Orientation of dipole moments d) Change in polarity of every dipole

Last Answer : b) Electric dipole moment per unit volume

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 electromagnetic waves, the electric field will be perpendicular to which of the following? a) Magnetic field intensity b) Wave propagation c) Both H and wave direction d) It propagates independently

Last Answer : c) Both H and wave direction

Description : A magnetic field exists around (a) iron (b) copper (c) aluminium (d) moving charges

Last Answer : (d) moving charges

Description : he work done of vectors force F and distance d, separated by angle θ can be calculated using, a) Cross product b) Dot product c) Addition of two vectors d) Cannot be calculated

Last Answer : b) Dot product

Description : Find the electric field intensity of a charge 2.5C with a force of 3N. a) -7.5 b) 7.5 c) 2.5/3 d) 3/2.5

Last Answer : d) 3/2.5

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 : Which of the following is true regarding magnetic lines of force? a) Real b) Imaginary c) Does not exist d) Parallel to field

Last Answer : b) Imaginary

Description : In an field having a force of 12N and distance 20cm, the torque will be a) 0.24 b) 2.4 c) 24 d) 12/20

Last Answer : b) 2.4

Description : The magnetic force impacts the energy of the field. State True/false. a) True b) False

Last Answer : a) True

Description : Find the maximum force of the conductor having length 60cm, current 2.75A and flux density of 9 units. a) 14.85 b) 18.54 c) 84.25 d) 7.256

Last Answer : a) 14.85

Description : The force on a conductor of length 12cm having current 8A and flux density 3.75 units at an angle of 300 is a) 1.6 b) 2 c) 1.4 d) 1.8

Last Answer : d) 1.8

Description : Find the Lorentz force of a charge 2.5C having an electric field of 5 units and magnetic field of 7.25 units with a velocity 1.5m/s. a) 39.68 b) 68.39 c) 86.93 d) 93.68

Last Answer : a) 39.68

Description : Find the magnetic force when a charge 3.5C with flux density of 4 units is having a velocity of 2m/s. a) 14 b) 28 c) 7 d) 32

Last Answer : b) 28

Description : Find the electric force when the charge of 2C is subjected to an electric field of 6 units. a) 6 b) 3 c) 12 d) 24

Last Answer : c) 12

Description : Find the force experienced by an electromagnetic wave in a conductor? a) Electrostatic force b) Magneto static force c) Electro motive force d) Lorentz force

Last Answer : d) Lorentz force

Description : Find the force due to a current element of length 2cm and flux density of 12 tesla. The current through the element will be 5A. a) 1 N b) 1.2 N c) 1.4 N d) 1.6 N

Last Answer : b) 1.2 N

Description : According to Faraday’s law, EMF stands for a) Electromagnetic field b) Electromagnetic force c) Electromagnetic friction d) Electromotive force

Last Answer : d) Electromotive force