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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
Magnetic field at the common centre C due to current in the coil X is :

A

`7.5xx10^(-4) T `

B

`7.5xx10^(-6) T `

C

`1 xx 10^(-4) T`

D

`2 xx 10^(-4) T `

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