When a charged particle enters a uniform magnetic field, its kinetic energy: a)increases b)decreases c)becomes zero d)remains constant..give reason.

Asked by sumandeesinghrana | 12th Oct, 2010, 08:35: PM

Expert Answer:

Kinetic energy remains constant.
Because magnetic force is always perpendicular to the motion of charge particle(ALWAYS)
Therefore work done by magnetic force is  
  Fm.ds = 0    where Fm is magnetic force.
Thumb Rule: Work done by magnetic force is always zero,No matter what the system is.
Magnetic force can only change the direction (atmost) of velocity (or motion)  but it can not change magnitude of velocity (never).

Answered by  | 13th Oct, 2010, 11:29: AM

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