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Q.

A uniform electric field E=(12m/e) V/m is created between two parallel plates of length 1 m as shown in figure. (where m=mass of electron and  e= charge of electron). An electron centers the field symmetrically between the plates with a speed of 2 m/s. The angle of the deviation (θ) of the path of the electron as it comes out of the field will be_____

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a

tan1(4)

b

tan1(2)

c

tan1(13)

d

tan1(3)

answer is D.

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Detailed Solution

We have  ay=Fym=c(E)m=e(12me)m=12m/s2
And  sx=uxt
 12×tt=12sec
And  vy=uy+ayt

vy=0+12×12vy=6m/s

tanθ=vyvx=62=3        θ=tan1(3)

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