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A long solenoid of radous R has n turns ...

A long solenoid of radous `R` has `n` turns of wire per unit length and carries a time-varying current that varies sinusiodally as `I = I_(max) cos omegat`, where `I_(max)` is the maximum current and `omega` I the angular frequancy of the alternating current source (shows in Fig.)

The magnitude of electric field outside the solenoid at a distance `r gt R` from its long central axis is

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