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Question
Cathode rays gain K.E. when they are accelerated by an electric field. If cathode rays are subjected to the action of magnetic field, then their
Cathode rays gain K.E. when they are accelerated by an electric field. If cathode rays are subjected to the action of magnetic field, then their
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Solution
The correct option is D Energy and momentum remain unaffected
Since the magnetic force acting on a moving electric charge is perpendicular to the motion of the charge - the WORK done on the moving charge is zero, meaning that its kinetic energy stays constant.Since the DIRECTION of the charge’s motion changes, we know that the momentum changes its direction also (but not its magnitude.)
Since the magnetic force acting on a moving electric charge is perpendicular to the motion of the charge - the WORK done on the moving charge is zero, meaning that its kinetic energy stays constant.Since the DIRECTION of the charge’s motion changes, we know that the momentum changes its direction also (but not its magnitude.)
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