an electron is released from rest inside a uniform electric field of 4x10^3 N/C
1. what is the magnitude of the force exerted on the electron by this field?
2. what is the time required for the electron to reach a speed of 10^6 m/s?
F.6 PHYSICS
2008-11-30 4:48 am
回答 (1)
2008-11-30 6:35 am
✔ 最佳答案
Data:Mass of electron, m = 9.11 X 10-31 kg
Magnitude of charge of electron, q = 1.6 X 10-19 C
1. In the uniform electric field,
By F = qE
F = (1.6 X 10-19)(4 X 103)
Magnitude of force, F = 6.4 X 10-16 N
2. Assume Newtonian mechanics is valid,
By Newton's 2nd law of motion,
F = ma
6.4 X 10-16 = 9.11 X 10-31 a
Acceleration, a = 7.03 X 1014 ms-2
By v = u + at
106 = 0 + (7.03 X 1014)t
Time required, t = 1.42 X 10-9 s
參考: Myself~~~
收錄日期: 2021-04-23 21:06:54
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