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 isA. `8pixx10^(-4)T` if current in the coil are in same sense.B. `4pixx10^(-4)T` if current in the coil are in opposite sense.C. Zero if currents in the coils are in opposite sense.D. `8pixx10^(-4)T` if current in the coil are in opposite sense.

Two circular coil of radii 5cm and 10cm carry equal currents of 2A. Th

1.	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 isA. `8pixx10^(-4)T` if current in the coil are in same sense.B. `4pixx10^(-4)T` if current in the coil are in opposite sense.C. Zero if currents in the coils are in opposite sense.D. `8pixx10^(-4)T` if current in the coil are in opposite sense.
Answer» Correct Answer - A,C `B_(1)=(mu_(0)N_(1)I)/(2r_(1))+(mu_(0)N_(2)I)/(2r_(2))` `=8000pixx10^(-7)=8pixx10^(-4)T`

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