First slide

Force on a current carrying wire placed in a magnetic field

Question

A conducting loop carrying a current i is placed in a uniform magnetic field acting perpendicular to the plane of the coil as shown in fig. The loop will have
a tendency to

Moderate

A

contract
B

expand
C

moves towards positive X-axis
D

moves towards positive Y-axis

Solution

The force acting on each element of the coil is radially outward. This produces tension in the loop and hence the loop will expand.

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