A beam of electron passes undeflected through mutually perpendicula...

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

W magnetic field is maintained, the electrons move
\( \theta \)
(A) in a circular orbit
(B) along a parabolic path
(C) along a straight line
(D) in an elliptical orbit.
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