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A solenoid has 2000 turns wound over a l...

A solenoid has `2000` turns wound over a length of `0.3 m`. Its cross-sectional area is equal to `1.2 xx 10^(-3) m^(2)`. Around its central cross-section a coil of `300` turns in wound. If an initial current of `2 A` flowing in the solenoid is reversed in `0.25 s`, the emf induced in the coil is

A

`2.4xx10^(-4)V`

B

`2.4xx10^(-2)V`

C

`4.8xx10^(-4)V`

D

`4.8xx10^(-2)V`

Text Solution

Verified by Experts

The correct Answer is:
B
`n=(N)/(l)=(2000)/(0.3)=(20000)/(3)`
`xi =(d)/(dt)(NBA)=NA(dB)/(dt)`
Since `B=mu_(0)nI`
`rArr xi =(mu NAn)(dt)/(dt)rArr =0.024 V`
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DISHA PUBLICATION-ELECTROMAGNETIC INDUCTION -EXERCISE - 2 : Concept Applicator
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