Question

A coil of area $100cm^{2}$ has 500 turns. Magnetic field of $0.1\mspace{6mu} weber/metre^{2}$ is perpendicular to the coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is

• A. 1 V
• B. 5 V
• C. 50 V
• D. Zero

Answer 1

Answer: (B)

5 V

Answer 2

$e = - \frac{N(B_{2} - B_{1})A\cos\theta}{\Delta t}$

$= - \frac{500 \times (0 - 0.1) \times 100 \times 10^{- 4}\cos 0}{0.1} = 5V$