Question

A magnetic field is applied at perpendicular to the axis of cylindrical discharge tube then cathode and positive rays deflected in-

• A. Same direction
• B. Opposite direction
• C. Mutually perpendicular direction
• D. No deflection for both

Answer 1

The correct option is A Same direction

$Given:$ A magnetic field is applied at perpendicular to tghe axis opf cylindrical discharge tube then cathode and positive rays deflected.

$Solution:$ The cathode rays go from cathode to anode and the anode rays go from anode to cathode, hence the velocity of both are in opposite direction. They are bent in the direction of $q(v\times B)$Since the electrons are negative then the direction of the deflection /force on the particles will be the same.

$So,the$ $correct$ $option:A$