Question

Magnetic field associated with loop is given by graphs below. [Take anticlockwise current positive]

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

$|i_{induced}|\propto |E_{induced}|\propto |\frac{dB}{dt}|$(slope of B-t graph)
So, $i$ is non zero initially, then becomes zero and becomes non zero again. By lenz law, the direciton of current initailly is anti-clockwise or positive, and in the end, the current is clockwise or negative.