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A 800 trun coil of effective area 0.05 ...

A 800 trun coil of effective area `0.05 m^(2)` is kept perpendicualr to a megnetic field `5 xx10^(-5)` T . When the plane of the coil is rotated by ` 90^(@)` around any of its coplanar axis in `0.1 ` s , the emf induced n the coil will be :

A

0.02V

B

2V

C

0.2V

D

`2xx10^(-3)V`

Text Solution

Verified by Experts

The correct Answer is:
A
`e_("induced")=(-dphi)/(dt)=(-Deltaphi)/(dt)`
`phi_(i)=N(vecB.vecA)phif=0`
`phi_(i)=800xx5xx10^(-5)xx5xx10^(-2)`
`Deltat=0.15`
`E_("induced")= -((0-800xx5xx10^(-5)5xx10^(-2)))/(0.1)`
`e_("induced")=0.02V`
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