Home Physics Moving Charge and Magnetism Magnetic Force on a Current Carrying Wire A conducting loop carrying a current I is pl…
Physics Moving Charge and Magnetism Magnetic Force on a Current Carrying Wire MCQ (Single Correct)

A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to.

A
move along the positive x direction
B
move along the negative x direction
C
contract
D
expand

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Verified by Experts
The correct answer is:
D

The net force on a current-carrying loop in a uniform magnetic field is zero. Hence, the loop cannot translate.

From Fleming's left-hand rule, we can see that if the magnetic field is perpendicular to paper inwards and current in the loop is clockwise the magnetic force on each element of the loop is radially outwards or the loop will have the tendency of expanding.

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