When two conductors carry currents in the same direction the force is repulsive.

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Question
When two conductors carry currents in the same direction the force is repulsive.
Options
A. True
B. False

Correct Answer

False

Explanation

The force is attractive.

Materials and Components problems

Search Results

1. The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about
Options
A. sign of charge carrier
B. density of charge carrier
C. both sign and density of charge carrier
D. none of the above

3. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component v_x is x direction. Then
Options
A.
B.
C.
D.

4. A specimen of metal has n valence electrons per m³. If v_x is the average velocity of these electrons, each having a charge e, the current density J is
Options
A. J = ne v_x
B. J = - ne v_x
C. J =
D. J =

7. For dielectrics in alternating field, polarizability a_e is a complex quantity. The imaginary part of a_e is zero for
Options
A. ? = 0
B. ? ? ?
C. ? = 0 and ? ? ?
D. ? = natural frequency ?₀

9. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ?, the magnetic dipole moment of orbit is 0.5 e?R².
Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

10. For making a capacitor it is better to have a dielectric having
Options
A. high permittivity
B. low permittivity
C. permittivity same as that of air
D. permittivity which is neither high nor low

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