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JEE Main 2003 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2003

A particle of mass and charge Q moving with velocity describe a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is

Answer: (2)

Solution

The magnetic force is always perpendicular to the velocity (and to the displacement), so it does no work: $W

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Question ID VK-038117