Two insulating plates are both uniformly charged in such a way that the potential difference between them is V 2 - V 1 = 20 V. (i.e. plate 2 is at a higher potential). The plates are separated by d = 0.1 m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2? (e = 1.6 × 10 -19 C, m e = 9.11 × 10 -31 kg)
Text Solution
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By work energy theorem:
W all forces = 
KE
So, q( 
V) = KE final – KE Initial
or 1.6 × 10 –19 × (20) = 
× 9.11 × 10 –31 × v 2
v = 2.65 × 10 6 m/s
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