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Magnetics question

2016 · Shift 0 · Q47

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JEE Main
Physics
Magnetics
2016 · Shift 0 · Q47

Magnetics question

2016 · Shift 0 · Q47

JEE MainPhysicsMagneticsMCQ+4 / −1

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 fields at the centres of the circle and square respectively, then the ratio

{{{B_A}} \over {{B_B}}}

is:

A
${{{\pi ^2}} \over {16}}$
B
${{{\pi ^2}} \over {8\sqrt 2 }}$
C
${{{\pi ^2}} \over {8}}$
D
${{{\pi ^2}} \over {16\sqrt 2 }}$

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