Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and `0.3` ampere current in opposite direction. The magnetic field in `Wb//m^(3)` at the centre isA. `mu_0//80`B. `7mu_0//80`C. `(5//4)mu_0`D. zero

Two concentric circular coils of ten turns each are situated in the sa

1.	Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and `0.3` ampere current in opposite direction. The magnetic field in `Wb//m^(3)` at the centre isA. `mu_0//80`B. `7mu_0//80`C. `(5//4)mu_0`D. zero
Answer» Correct Answer - C `B=(mu_0nI)/(2pia)because Bprop(n I)/(a)` `B_1-B_2=(mu_0n)/(2)[(I_1)/(a_1)-(I_2)/(a_2)]` `=(10xx4pixx10^-7)/(2xx10^-2)[(0.2)/(20)-(0.3)/(40)]` `B_1-B_2=(4pixx10xx2xx10^-7)/(2xx10^-2xx800)=1.57xx10^-6=(5mu_0)/(4)T` .

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Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and `0.3` ampere current in opposite direction. The magnetic field in `Wb//m^(3)` at the centre isA. `mu_0//80`B. `7mu_0//80`C. `(5//4)mu_0`D. zero

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