Magnetic field induction at the centre O...

Magnetic field induction at the centre O of a square loop of side a carrying current I as shown in figure.

A

`(mu_(0)I)/(sqrt2 pi a)`

B

`2 sqrt2 (mu_(0)I)/(pi a)`

C

`(2mu_(0)I)/(pi a)`

D

Zero

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The correct Answer is:

D

Field due to AB opposes and cancel the field due to DC.
Similarly field due to BC opposes and cancel the field due to AD.
`therefore B = 0`

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