Dear Golu

According to Lenz’s law, induced emf in a circuit opposes the cause due to which it was induced.

hence emf will be induced in such a way that current is in anticlockwise direction. current in anticlockwise direction will Produce B that is in opposite direction of original B.

graph will be constant as dΦ/dt is constant

for t1 to t2 it will be zero and then it will change direction (will become clockwise)

answer will be C

All the best.

AKASH GOYAL

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