Q.

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

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a

in an elliptical orbit

b

in a circular orbit

c

along a parabolic path

d

along a straight line

answer is B.

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Detailed Solution

If beam of electrons passes undeflected, then force due to electric field should be balanced with force due to magnetic fields Fe = Fm.  But if electric field becomes zero, then only force due to magnetic field exists. Under this force, the charge moves along a circle.
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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