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Magnetic field at a distance 'a' from lo...

Magnetic field at a distance 'a' from long current carrying wire is proportional to -

A

`(1)/(a)`

B

`(1)/(a^(2))`

C

`(1)/(sqrt(a))`

D

`(1)/(a^(3//2))`

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The correct Answer is:
A
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