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Q.

The block shown in the diagram has a mass of 2 microgram and a charge of 2x10-9 coulomb. If the block is given an initial velocity of 2 ms-1 in X direction at t = 0 and an electric field of 2 NC-1 in X direction is switch on at that moment, then R Will be (g= 10 ms-2)

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a

4 m

b

1 m

c

2 m

d

3 m

answer is D.

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Detailed Solution

Along y-direction Sy=uyt+12ayt2  …………(1)⇒ 5=0+12×g×t2t=10g=1sAlong x-directionSx=uxt+12axt2 ……………(2)⇒ R=2×t+12qEmt2⇒ R=2×1+12×2×10−9×22×10−9×1⇒ R=2+1=3 m
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