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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is tesla. The field of induction at a distance 12 cm from the same current would be [CBSE PMT 1990, D PMT 2001]

Answer: (A)

Solution

, so T; the field must decrease

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Question ID VK-078682