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When a charged particle passes through a region of uniform magnetic field

$\begin {array} {1 1} (a)\;Kinetic\: energy\: changes\: but\: momentum\: is\: constant \\ (b)\;Momentum\: changes\: but\: kinetic \: energy \: is\: constant \\ (c)\;Both \: momentum\: and\: kinetic\: energy\: remain\: constant \\ (d)\;Both\: momentum \: and \: kinetic\: energy\: change \end {array}$

When acharged particle moves in a magnetic field its velocity vector changes and hence Momentum also changes.
Magnetic forces do no work.
Ans : (b)

edited Sep 19, 2014