A rectangular loop of wire shown below is coplanar with a long wire carrying current $I$. The loop is pulled to the right a s indicated. What are the directions of the induced current in the loop and the magnetic forces on the left and the right sides of the loop?
| Induced current | Force on left side | Force on right side | |
| $a.$ | Counter clockwise | To the left | To the right |
| $b.$ | clockwise | To the left | To the right |
| $c.$ | Counter clockwise | To the right | To the left |
| $d.$ | clockwise | To the right | To the left |
KVPY 2011, Medium
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(b)
The loop $A B C D$ is moving from region of high flux to low flux in region of a downward magnetic field.
Following Lenz's law induced emf must be directed to increase the flux. Hence, direction of induced emf is clockwise in the loop.
Hence, current in wire and $A D$ length are parallel. So, there is attraction in wire and $A D$ length.
Similarly, there is repulsion in $B C$ and wire.
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