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The figure shows three indentical curren...

The figure shows three indentical current carryng square loops `A, B` and `C`. Identify the correct statement related to magnetic field B at the centre `O` of the square loop. Current in each wire is I.

A

`vecB` is zero in all cases

B

`vecB` is zero only in case of C

C

`vecB` is non zero in all cases

D

`vecB` is non zero only in case of B

Text Solution

Verified by Experts

The correct Answer is:
B
In (c), two wires are producing `square` magnetic field and two wires are producing `ox` magnetic field.
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