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JEE Main 2022 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2022

A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be

Answer: (2)

Solution

By Ampere's law, : $B(2π r) = μ

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Question ID VK-024933