If a charged particle enters perpendicularly in the uniform magnetic field then
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(a)
Work done by magnetic force will always be zero as $\vec{F} \perp \bar{V}$ so using work energy theorem
$W_{\text {all }}=\Delta K$
$W=0$
$\Rightarrow k=\text { constant }$
$\vec{P}$ change as direction of velocity changes.
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