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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

The strength of the magnetic field at a point distant r near a long straight current carrying wire is B. The field at a distance will be

Answer: (B)

Solution

, so halving the distance doubles the field to 2B; B/2 and B/4 would need an increase in

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Question ID VK-078625