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A cylindrical conductor of diameter 0.1 ...

A cylindrical conductor of diameter 0.1 mm carries a current of 90 ma. The current density (in A `m^(-2)`) is `(pi~~3)`

A

`1.2 xx10^7`

B

`3xx10^6`

C

`6xx10^6`

D

`2.4xx10^7`

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The correct Answer is:
A
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