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 $
