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1.	A moving particle of charge q and mass m enters a uniform magnetic field perpendicular to the direction of field. Then(A) its energy increases(B) its energy remains constant(C) it follows a circular path(D) its velocity vector changes
Answer» A moving charge particle enters a uniform magnetic field perpendicular to the direction of field. Then it follow a circular path. The magnetic field perpendicular to velocity. So, the particle will perform a uniform circular motion and thus speed will not change and thus no change in kinetic energy. Option (C) is correct.

A moving particle of charge q and mass m enters a uniform magnetic field perpendicular to the direction of field. Then(A) its energy increases(B) its energy remains constant(C) it follows a circular path(D) its velocity vector changes

Answer»

A moving charge particle enters a uniform magnetic field perpendicular to the direction of field. Then it follow a circular path.

The magnetic field perpendicular to velocity. So, the particle will perform a uniform circular motion and thus speed will not change and thus no change in kinetic energy.

Option (C) is correct.

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