Moving Charges and Magnetism - Result Question 11

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

(a) in a circular orbit

(b) along a parabolic path

[2007]

(c) along a straight line

(d) in an elliptical orbit.

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Answer:

Correct Answer: 11. (a)

Solution:

  1. (a) If the electric field is switched off, and the same magnetic field is maintained, the electrons move in a circular orbit and electron will travel a magnetic field perpendicular to its velocity.