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A current carrying wire is bent into the...

A current carrying wire is bent into the shape of a square coil. The magnetic field produced at the entre of coil by one arm BC is B. Then the resultant magnetic field at the centre due to all the arms will be-

A

4B

B

`(B)/(2)`

C

B

D

`(2)/(B)`

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The correct Answer is:
A
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