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21 An infinitely long cylindrical wire of radius R carries a current whose density varies...

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21 An infinitely long cylindrical wire of radius R carries a current whose density varies as j br where b is a constant and r is the distance from axis of the wire Choose the correct option regarding magnetic field of induction as function of radial distance from axis of cylinder fr is less than R B Hobr 4 C if r is greater than R B HobR4 2r J B ifr is less than R B Hobr 2 D if r is greater than R B HobR4 2

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