Two insulating plates are both uniformly charged in such a way that the potential difference between them is V2-V1=20V. (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 x 10-19C, m0=9.11 x 10-31kg

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2.65 x 106 m/s

7.02 x 1012 m/s

1.87 x 106 m/s

32 x 10-19 m/s

answer is A.

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Detailed Solution

For electron 12mv2=eEd=eV2-V1⇒v=2eV2-V1m

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