A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as

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1r3/2

1r2

1r3

answer is D.

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Detailed Solution

B=μ0iR22R2+r23/2 if r>>R , B∝1r3

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