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A thick current carrying cable of radius...

A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its crosssection. The variation of magnetic field B(r) due to cable with distance 'r' from the axis of the cable is represented by.

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
Inside a current carrying cylindrical conductor
`B = (mu_(0) I)/(2pi R^(2)) ""r`
`implies B prop r`
Outside the conductor ,
`B = (mu_(0) I)/(2m) implies B prop (1)/(r )`
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