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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

The core of a toroid having 3000 turns has inner and outer radii 11 cm and 12 cm, respectively. The magnetic field in the core for a current of 0.70 A is 2.5 T. The relative permeability of the core is

Answer: (A)

Solution

Mean radius cm,

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Question ID VK-080622