Which of the property a proton can change

Question.
Which of the property a proton can change when it moves freely in a magnetic field ? (There may be more than one correct answer)

(1) mass

(2) speed

(3) velocity

(4) momentum

solution:

Motion of a charged particle like proton in a magnetic field is a circular path. Hence, its velocity and momentum can change.

Thus,

option (3) and (4) are correct.

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