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A circular coil of radius r carries a cu...

A circular coil of radius r carries a current I. The magnetic field at its centre is B. At what distance from the centre, on the axis of the coil the magnetic field wil be B/8 ?

A

` R sqrt(2)`

B

`Rsqrt(3)`

C

2R

D

3R

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The correct Answer is:
B
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