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MHT CET Physics question

PhysicsMagnetism and MatterMHT CET

Not in JEE Advanced syllabus

A T.G having radius of circular coil r and number of turn's N gives deflection with certain current. If radius is increased to 2r, what should be the number of turns if the galvanometer still gives deflection with the same current:

Answer: (B)

Solution

For the same current and deflection must be constant, so n must be

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Question ID VK-078510