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Question
Which of the following property of a proton can change while it moves freely in a uniform magnetic field?
Options:
A .  Mass
B .  Speed
C .  Velocity
D .  Charge
Answer: Option C
:
C
When a proton enters a uniform magnetic field, it starts to move in a circular manner. We know that the velocity of the particle changes when it undergoes circular motion as the direction is always changing. Hence, the velocity of the proton changes when it enters into a magnetic field.

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