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Question

Cathode rays are made to pass between the poles of a magnet perpendicular to axis. The effect of the magnetic field is
  1. to increase the velocity of rays
  2. to deflect them upward above the plane of paper
  3. to deflect them toward the south pole
  4. to deflect them towards the north pole

A
to increase the velocity of rays
B
to deflect them towards the north pole
C
to deflect them upward above the plane of paper
D
to deflect them toward the south pole
Solution
Verified by Toppr

The force on cathode rays which constitutes electron particles, due to perpendicular Magnetic field is Fe(v×B) which is perpendicular to the plane of velocity and Magnetic field.
So cathode rays are deflected upward above the plane of paper.

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