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Solution


Q.

Which of the following property of a proton can change while it moves freely in a magnetic field
1 Mass  
2 Speed  
3 Velocity  
4 Charge  

Ans.

(3)

Velocity of a proton can change while it moves freely in a magnetic field because each moving charged particle in a magnetic field experiences a force. The direction of force experienced by a positively charged proton can be studied by Fleming’s Left-hand Rule.

The force acting on the proton would change both velocity and momentum when it moves freely in magnetic field. If a charged particle’s velocity is completely parallel to the magnetic field, the magnetic field will not exert any force on the particle, and thus the velocity will remain constant. Whereas, if the force is acting perpendicular to the direction of moving charge, work done will be zero. It means kinetic energy does not change. Hence, we can conclude that the force can change the direction of velocity of the proton but not its speed. Thus, momentum and velocity changes.