Which of following property of a proton cannot change while it moves freely in magnetic field?

Q. Which of following property of a proton cannot change while it moves freely in magnetic field?
Answer: Speed
Notes: When a proton enters in a region of magnetic field, it experiences a magnetic force. As a result of the force, the path of the proton becomes circular. Hence, its velocity and momentum changes.

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📌 Question Number: 30 in Physics GK 22 - Magnetism in the above course in App.

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