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Question

A electric field of 1.5×104NC1 exists between two parallel plates of length 2 cm. An electron enters the region between the plates at right angles to the field with a kinetic energy of Ek=2000eV. The deflection that the electron experiences at the deflecting plates is:


A
0.34 mm
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B
0.57 mm
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C
7.5 mm
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D
0.75 mm
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Solution

The correct option is D 0.75 mm
Initial energy of e=2000 ev
12mev2=2000 ev
v=2 Ekme
time taken to travel 2 cm=2×102me2Ek
Now displacement S=12a E2
=12(Eυm)4×104m2Ek
12×1.5×104×e×4×1042×2000×e J
S=0.75 mm

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