Question

A coil of area 100 cm² has 500 turns. Magnetic field of 0.1 weber/metre² is perpendicular to the coil. The field is reduced to zero in 0.1 sec. The induced emf in the coil is

• A. 1 V
• B. 5 V
• C. 50 V
• D. Zero

Answer 1

Answer: (B)

5 V

Answer 2

By using $e = - \frac{N(B_{2} - B_{1})A}{t};$

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