Question

A coil having an area $2m^{2}$ is placed in a magnetic field which changes from $1Wb/m^{2}$to $4Wb/m^{2}$in a interval of 2 second. The e.m.f. induced in the coil will be

• A. 4 V
• B. 3 V
• C. 1.5 V
• D. 2 V

Answer 1

Answer: (B)

3 V

Answer 2

$|e| = A.\frac{\Delta B}{\Delta t} = 2 \times \frac{(4 - 1)}{2} = 3\mspace{6mu} V$.