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Q.

The magnetic flux of 500 μ Wb per turn passing through a 200 turn coil is reversed in 20×10-3 seconds. The average e.m.f. induced in the coil in volt is

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a

10.0

b

2.5

c

7.5

d

5.0

answer is D.

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Detailed Solution

ϕ=500×10−6Wb,N=200, t=20×10−3s 

Given that coil is reversed

∴e=2Nϕt=2×200×500×10−620×10−3=10V

                    

 

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