Which of the following property of a proton can change while it moves freely in a magnetic field? (There my be more than one correct answer.)
A
Mass
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B
Speed
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C
Velocity
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D
Momentum
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Solution
The correct options are C Velocity D Momentum Each moving charged particle in a magnetic field experiences a force. The direction of force experienced by a positive charge (i.e., a proton) is given by Fleming's left hand rule. The force acting on the proton would change both velocity and momentum.