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X and Y are two concentric and coplanar ...

X and Y are two concentric and coplanar circular coils carrying currents 6 A and 2A in opposite direction as shown. Their radii are `R_x= 8 pi` and `R_Y = 4 pi` cm, whereas number of turns in X and Y are 50 and 100 respectively
Resultant magnetic field at the common centre C due to the current in the coil X and Y is :

A

`2.5 xx 10^(-3) T `

B

`2.5 xx 10^(-4) T `

C

`2.5 xx 10^(-5) T `

D

`2.5 xx 10^(-6) T `

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