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Current flows through a straight cylindr...

Current flows through a straight cylindrical conductor of radius r. The current is distributed uniformly over its cross-section. The magnetic field at a distanace x from the axis of the conductor has magnitude B:

A

`B=0` at the axis

B

`B prop x` for `0 le x le r`

C

`B prop 1/x` for `x gt r`

D

`B` is maximum for `x=r`

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The correct Answer is:
A, B, C, D
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