NEET 2007 Physics question

Physics Moving Charges and Magnetism NEET 2007

A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move

(1)along a straight line
(2)in an elliptical orbit
(3)in a circular orbitCorrect
(4)along a parabolic path

Answer: (3)

Solution

The electrons pass undeflected when the electric force balances the magnetic force: , i.e. , with , and mutually perpendicular. When the electric field is switched off, only the magnetic force acts. This force is always perpendicular to the

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Question ID VK-089918