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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A circular coil of radius 2 R is carrying current I. The ratio of magnetic fields at the centre of coil and at a point at a distance 6 R from centre of the coil on axis of coil is:

Answer: (B)

Solution

Centre: ; axis at :

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Question ID VK-078293