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NEET 2007 (AIPMT) · Cathode Rays, Thomson's Experiment & Gas Discharge

Cathode Rays, Thomson's Experiment & Gas Discharge question from NEET 2007 (AIPMT)

Q3NEET 2007 · AIPMTMedium

Cathode Rays, Thomson's Experiment & Gas Discharge

A beam of electron 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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Answer: (a)

With $\vec{E}$ off, only the magnetic force $q\vec{v} \times \vec{B}$ acts.
This force is always perpendicular to $\vec{v}$ (and $\vec{v} \perp \vec{B}$ ), so it gives a constant centripetal force.
So the electrons move in a circular orbit: answer (a).

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