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Two circular coil of radii 5cm and 10cm ...

Two circular coil of radii 5cm and 10cm carry equal currents of 2A. The coils have 50 and 100 turns, respectively, and are placed in such a way that their planes as well as their centers coincide. Magnitude of magnetic field at the common centre of coils is

A

`8pixx10^(-4) T` if currents in the coils are in same sense

B

`4pixx10^(-4)T` if currents in the coils are in opposite sense

C

Zero if currents in the coils are in opposite sense

D

`8pixx10^(-4)T` if currents in the coils are in opposite sense

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