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Question

In a circular coil (1) of radius R, current I is flowing and in another coil (2) of radius 2R a current 2I is flowing, then the ratio of the magnetic fields produced by the two coils is

A
1:1
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B
2:1
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C
1:2
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D
3:1
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Solution

The correct option is A 1:1
Magnetic field for coil 1
b1=μ0Nl2R
Magnetic field for coil 2
B2=μ0N(2l)2(2R)=μ0Nl2R
B1B2=11

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