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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

The strength of the magnetic field at a distance r near a long straight current carrying wire is B. The field at a distance r/2 will be

Answer: (C)

Solution

Since , halving the distance doubles the field, so it becomes 2B; B/2 and B/4

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Question ID VK-078773