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A solenoid of radius R and length L has ...

A solenoid of radius R and length L has a current `I = I​_0` cosωt. The value of induced electric field at a distance of r outside the solenoid, is

A

`(mu_(0)nI_(0)omegaR^(2))/(2r) sin omega t`

B

`(mu_(0)nI_(0)omega R^(2))/r sinomega t`

C

`(mu_(0)nI_(0)R^(2))/(2r) sin omega t`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
A
According to question:
`(piR^(2))(dB)/(dt) = 2pirE`
where `B= mu_(0)nI`
Therefore `E = (mu_(0)nI_(0)omegaR^(2))/(2r) sin omega t`
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