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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

`Bpropx,` for `0 lt x lt r`

B

`B prop 1//x, `for `0 lt x lt r`

C

`B=0,` for `0 le x lt r`

D

`B=0`, only for `x=0`

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The correct Answer is:
C
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