Two identical wires A and B each of leng...

Two identical wires A and B each of length 'l' carry the same current I wire A is bent into a circle of radius R and wire B is bent to form a square of side 'a' if B_a and B_b are the values of magnetic field at the centre of the circle and square respectively then the ration `B_A/B_B ` is

`(pi^2)/(8sqrt2)`

`(pi^2)/8`

`(pi^2)/(16sqrt2)`

`(pi^2)/16`

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