Electric fields and forces
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Electric fields and forces

[From: ] [author: ] [Date: 11-08-18] [Hit: ]
Explain. (b) What will be the shape of the electrons trajectory? (c) During a certain amount of time in the electric field, the electron moves 25.0 cm to the right. How far does it move vertically during this time?......
An electron is initially moving to the right at 2.50 x 106 m/s. It enters a region of space where there is a constant electric field of magnitude 0.125 mN/C and directed upward. (a) In which direction will the electron accelerate? Explain. (b) What will be the shape of the electron's trajectory? (c) During a certain amount of time in the electric field, the electron moves 25.0 cm to the right. How far does it move vertically during this time?

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a) the electron will accelerate downward.
( the electron has the negative charge, the electron will experience the force on opposite direction with the electric field)

b) the shape of the electron's trajectory is parabolic

c) x = v * t
--> t = x/v = 0.25/2.5 x 10^6 = 1 x 10^-7 sec
y = (1/2) a * t^2 ---> a = q*E/m
= (1/2) * (q*E/m) * t^2
= (1/2) * (1.6 x 10^-19 * 0.125 x 10^-3/9.11 x 10^-31) * (1 x 10^-7)^2
= 1.10 x 10^-7 m
1
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