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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2 A and 0.3 A current in opposite direction. The magnetic field in tesla at the centre is

Answer: (D)

Solution

and act in opposite directions, so

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Question ID VK-078323