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JEE Main 2022 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2022

The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance r/2 from the centre is :

Answer: (3)

Solution

At the centre . On the axis, = with

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Question ID VK-024088