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Doubt & Answer Explanation

Doubt

A solenoid is of length 0.5m. the solenoid carries 2 ampere current. what is the magnetic moment of the solenoid? {taking n=20 per cm and r=0.01m}

Answer Explanation

M = NIA = (20 x 50)(2)( ? )r2 [N = number of turns total = 20 x 50, I = current = 2A, A = area of cross section = pi(r)2]

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