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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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a

1010

b

205

c

10

d

2010

answer is B.

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Detailed Solution

Magnetic field at the centre of the coil
B1=μ0i2(2R)=μ0i4R
Magnetic field at a point at a distance ‘6R’ along the axis of the coil
B2=μ0i(2R)22(6R)2+2R)23/2 ∴B1B2=1010

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