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A magnetic field of 2xx10^(-2)T acts at ...

A magnetic field of `2xx10^(-2)T` acts at right angles to a coil of area `100cm^(2)` with `50` turns. The average emf induced in the coil is `0.1V`, when it is removed from the field in time `t`. The value of `t` is

A

0.1 s

B

1 s

C

0.01 s

D

20s

Text Solution

Verified by Experts

The correct Answer is:
A
Given, `phi_(1)=NBA and phi_(2)=0`
`therefore E=-(dphi)/(dt)=(phi_(1)-phi_(2))/(t)=(NBA-0)/(t)=(NBA)/(t)`
`implies t=(NBA)/(E)=(50xx2xx10^(-2)xx100xx10^(-4))/(0.1)=0.1s`
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