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A coil of area 500cm^(2) and having 1000...

A coil of area `500cm^(2)` and having `1000` turns is held perpendicular to a uniform field of `0.4` gauss. The coil is turned through `180^(@)` in `1//10sec` . Calculate the average induced e.m.f.

A

0.01

B

0.02

C

0.03

D

0.04

Text Solution

Verified by Experts

The correct Answer is:
D
Initial flux `phi_(1)=NBAcos0^(@)=NBA`
Final flux
`phi_(f)=NBAcos 182^(@)=-NBA`
Change in flux
`Deltaphi=Deltaf_(f)-Delta_(i)=-2NBA`
Average induced emf
`epsilon_(av)=-(Deltaphi)/(Deltat)=(2NBA)/(Deltat)`
`=(2xx1000xx0.4xx10^(-4)xx500xx10^(-4))/0.1=0.04V`
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