Question

# A particle having charge $$q$$ and mass $$m$$ is projected with velocity $$v= 2\hat i -3\hat j$$ in a uniform electric field $$E=E_0\hat j$$. Change in momentum $$\left| \Delta p \right|$$  during any time interval is given by

A
13 m
B
qE0t
C
qE0tm
D
Zero

Solution

## The correct option is B $$qE_0t$$$$v=2\hat { i } -3\hat { j }$$charge $$=q$$mass $$=m$$field $$=E={ E }_{ 0 }\hat { j }$$ change in moment $$(AP)$$ during any time interval $$=$$$$\Delta p=$$ momentum        $$=p\times t$$$$p=q{ E }_{ 0 }$$   $$=q{ E }_{ 0 }\times t$$PhysicsNCERTStandard XII

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