1.

A solenoid of radius R number of turn per unit length n and length L has a current I=I_(0) cos omega t. The value of induced electric field at a distance of r outside the solenoid, is :

Answer»

`(mu_(0)nI_(0)OMEGAR^(2))/(2R) SIN omega t`
`(mu_(0)nI_(0)omegaR^(2))/(r ) sin omega t`
`(mu_(0)nI_(0)R^(2))/(2r) sin omega t`
zero

Solution :`OINT vec (E ). Vec(dl) = -(d varphi)/(dt)`
`E2pi r = -pi R^(2) (d)/(dt) mu_(0)ni`
`E = (mu_(0)nI_(0)omegaR^(2))/(2r) sin omega t`.


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