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 $weber/{m^2}$ at the centre is
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 $weber/{m^2}$ at the centre is
- A
$\frac{{35}}{4}{\mu _0}$
- B
$\frac{{{\mu _0}}}{{80}}$
- C
$\frac{7}{{80}}{\mu _0}$
- D
$\frac{5}{4}{\mu _0}$
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