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JEE Main 2014 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2014

A positive charge 'q' of mass 'm' is moving along the +x axis. We wish to apply a uniform magnetic field B for time so that the charge reverses its direction crossing the y axis at a distance d. Then:

Answer: (3)

Solution

To reverse its direction the charge must describe a semicircle, so the distance d at which it recrosses the y axis is the diameter: . From

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Question ID VK-104544