A coil has an area 100cm2and50turns. Its resistance is 2Ω. It is kept perpendicular to a magnetic field of induction 0.02Wbm−2. If it is removed in 1s, the average induced emf is
A
−0.01V
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B
0.02V
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C
0.03V
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D
0.05V
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Solution
The correct option is A−0.01V
Given: A=100 cm2, N=50, R=2 ,b=0.02 ,t=1 sec
Solution: by using the formula
ε=−Ndϕdt=−NBA(cosθ1−cosθ2)t
Remember that cosθ1=00(as area vector is parallel to the magnetic field) but cosθ2 does not have any value because it is removed (ATQ)