If cathode rays are projected at right angles to a magnetic field, their trajectory is

Ellipse

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Circle

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Parabola

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None of these

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Solution

The correct option is D Circle

Let the magnetic field be along North direction. Let cathode ray pass perpendicular to the magnetic field towards east.then it gets deflected downwards.
Fleming's left hand rule is meant for the movement of positively charged particles. But cathode rays are stream of negatively charged electrons. So opposite to the previous one.
And like postive charge it will make a circular trajectory.

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