Moving Charges and Magnetism - Result Question 21

21. A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will

(a) continue to move due east

[1997]

(b) move in a circular orbit with its speed unchanged

(c) move in a circular orbit with its speed increased

(d) gets deflected vertically upwards.

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Answer:

Correct Answer: 21. (b)

Solution:

  1. (b) In a perpendicular magnetic field, the path of a charged particle is a circle, and the magnetic field does not cause any change in energy.