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Question

A charged particle is projected perpendicular to a uniform electric field of length 2 m and initial velocity of charged particle is 10 m/s. Calculate deflection of the charge in the direction of electric field., when it leaves it.


A
4 mm
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B
6 mm
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C
8 mm
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D
9 mm
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Solution

The correct option is A 4 mm
Time taken to cross electric field region
t=dv=210=0.2 sec
Acceleration of particle in direction of E.F
a=qEm=2×105×100102=0.2 m/s2

Using y=ut+12at2
y=0+12×0.2×(0.2)2
y=4×103
y=4 mm is the defelection in the direction of E.F

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