Question

A rectangular coil of 20 turns and area of cross- section 25 sq cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 Tesla per second, the current in the coil is

• A. 1.0 ampere
• B. 50 ampere
• C. 0.5 ampere
• D. 5.0 ampere

Answer 1

Answer: (C)

0.5 ampere

Answer 2

$i = \frac{|e|}{R} = \frac{N}{R}.\frac{\Delta B}{\Delta t}A\cos\theta = \frac{20}{100} \times 1000 \times (25 \times 10^{- 4})\cos 0^{o}$

$\Rightarrow i = 0.5\mspace{6mu} A$