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Question

A particle of mass 103kg and charge 5μC is thrown at a speed 20 m s1 against a uniform electric field of strength 2×105N C1. How much distance will it travel before coming to rest momentarily?

A
0.1 m
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B
0.3 m
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C
0.05 m
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D
0.2 m
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Solution

The correct option is D 0.2 m
Force on particle=F=qE in opposite direction of motion

And, F=ma=qE

a=qEm=5×106×2×105103

a=103m/s2 and this acceleration is negative since particle is thrown against force.
And final velocity is v=0

Using v2u2=2as

0202=2×1000×s

s=0.2m

Answer-(D)

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