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NEET 2016 Physics question

PhysicsMoving Charges and MagnetismNEET 2016

A long straight wire of radius carries a steady current . The current is uniformly distributed over its cross-section. The ratio of the magnetic fields and , at radial distances and respectively, from the axis of the wire is:

Answer: (3)

Solution

Use Ampere's circuital law. Inside the wire (): the enclosed current is , so \dfrac{a}{2}\dfrac{I}{4}$ ⇒ B

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Question ID VK-091860