In a closed loop, which has some inductance but negligible resistance, uniform but time varying magentic field is applied directed into the plane of the loop. Variation of field with time is shown in Fig. Initially current in loop was zero. Then .

Options

A. emf induced in the loop is zero at t = 2 s
B. current in the loop will be maximum at r = 2 s
C. direction of emf in the loop will change at t = 2 s
D. None of the above

Answer

A, C

Explanation

`e=-(dphi)/(dt)=-A.((dB)/(dt))=-A("Slope of B-t graph")`
At t = 2, slope is zero and it changes its sign.