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Q.

Magnetic fields at two points on the axis of a circular coil at a distance of 1m and 5m from the centre are in the ratio 27 : 1.  The radius of the coil is 

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a

2 m 

b

12m

c

1 m

d

2m

answer is C.

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Detailed Solution

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BA=B0(1+x2r2)3/2

B1B2=(1+25r2)3/2(1+1r2)3/2=271

r=2 m

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