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Q.

A circular coil of radius 2R is carrying current ‘i’. The ratio of magnetic fields at the centre of the coil and at a point at a distance 6R from the centre of the coil on the axis of the coil is

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An Intiative by Sri Chaitanya

a

10

b

1010

c

205

d

2010

answer is B.

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Detailed Solution

BC=μ0i2r;Ba=μ0ir22r2+x232;BcBa=1010

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