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The magnetic field at a distance 'a' fr...

The magnetic field at a distance 'a' from along wire carrying current 'I' is `0.4 tau` . The magnetic field at a distance '2a' is __________ .

A

`0.1 tau`

B

`0.2 tau`

C

`0.8 tau`

D

`1.6 tau`

Text Solution

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The correct Answer is:
b
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