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Two concentric circular coils, each havi...

Two concentric circular coils, each having 10 turns with radii 0.2 m and 0.4 m carry currents 0.2 A and 0.3 A respectively in opposite direction. Magnetic field at the centre is

A

`(2//3)mu_0`

B

`(5//4)mu_0`

C

`(1//4)mu_0`

D

`(1//6)mu_0`.

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