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A circular coil 'A' has a radius R and t...

A circular coil 'A' has a radius R and the current flowing through it is i. Another circular coil 'B' has a radius 2R and if 2i is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e. `B_(A) to B_(B))`

A

`4:1`

B

`2:1`

C

`3:1`

D

`1:1`

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The correct Answer is:
D
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-II
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