Two concentric coplanner coils of turns ...

Two concentric coplanner coils of turns `n_1` and `n_2` have radii ratio 2 : 1 respectively. Equal current in both the coils flows in opposite direction. If net magnetic field is zero at their common centre then `n_1 : n_2` is : -

`2:1`

`1:2`

`1:1`

`4:1`

Text Solution

Verified by Experts

The correct Answer is:

Magnetic field at centre is zero
`B_1=B_2`
Given that =`(mu_0N_2l_2)/(2R_2)`
`(l_1=l_2, N_1:N_2 = n_1 :n_2 , R_1:R_2 =2:1)`
`=2/1`

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