Electro Magnetic Induction And Alternating Currents Question 398

Question: The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength $ 4\times {{10}^{-4}}Wb/m^{2} $ , if rotated through 90o in 0.1 s, the average emf induced in the coil is [Pb. PET 2002]

Options:

A) 0.012 V

B) 0.05 V

C) 0.1 V

D) 0.2 V

Show Answer

Answer:

Correct Answer: D

Solution:

$ e=\frac{-NBA(\cos {\theta_{2}}-\cos {\theta_{1}})}{\Delta t} $ $ =-\frac{500\times 4\times {{10}^{-4}}\times 0.1(\cos 90-\cos 0)}{0.1}=0.2\ V $



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