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Which of the following property of a proton can change while it moves freely in a magnetic field? (there may be more than one correct answer.)
(a) Mass (b) Speed
(c) velocity (d) momentum
The correct options are
(c) velocity and (d) momentum
Explanation - Mass of a proton cannot change.
So, (a) is not correct
When a proton enters a magnetic field, it starts moving in a circular motion.
In circular motion, speed is constant but velocity keeps changing.
So, (b) is not correct.
But, (c) is correct.
Momentum = Mass × Velocity
Since velocity changes, momentum will also change
So, (d) is also correct