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
A$a.$
B$b.$
C$c.$
D$d.$
KVPY 2011, Medium
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B$b.$
b (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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