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Question

Suppose that the particle is an electron projected with velocity vx=2.0×106ms 1. If E between the plates separated by 0.5 cm is 9.1×102N/C, where will the electron strike the upper plate? (qe=1.6×1019C,me=9.1×1031kg.)

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Solution

electron
charge=1.6×1019C
mass = 9.1×1031kg
and
Vx=2×106m/s
d=0.005m
Let the electron strike the up upper plate at the end of plate 'L' When deflection is 'S' therefore
S=qEL22mv2x

L=2dmv2xqE

=2×0.005×9.1×1031×2×106×2×1061.6×1010×9.1×102
=1.6×102m
=1.6cm

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