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Physics Question on Electromagnetic induction

A coil of 1200 turns and mean area of 500 cm2500\,cm^2 is held perpendicular to a uniform magnetic field of induction 4×10−4T4\times 10^{-4}T.The resistance of the coil is 20 ohms. When the coil is rotated through 180∘^\circ in the magnetic field in 0.1 seconds the average electric current (in mA) induced is :

A

12

B

24

C

36

D

48

Answer

24

Explanation

Solution

E=2NBAt,i=ERE = \frac{2NBA}{t} , i = \frac{E}{R}