Lesson 3.5 - Particle in an Electric Field
VIDEO LESSON (19:35 min)
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SOLUTION:
SOLUTION:
SOLUTION:
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A PARTICLE IN AN ELECTRIC FIELD
Consider two positively charged particles. One is fixed in space and the other is free to move around. Once the free one is released it will begin moving away from its original location, \(r_1\). Let's consider the energy of the system to analyse its motion at a point \(r_2\).
The energy lost from the potential energy is the kinetic energy gained. Note that this is the First Law of Thermodynamics.
RECALL
EXAMPLE PROBLEM #1
A \(3 \mu C\) charge is placed next to a \( 6 \mu C \) charge that is fixed in space. If they start out at 30cm from each other, what is the speed of the free particle when they are 1.0 m apart? Mass of moving charge is 160g.SOLUTION:
EXAMPLE PROBLEM #2
A cathode ray tube (CRT) is a television set uses a 5000V potential to accelerate electrons. What is the speed of an electron emitted from the CRT?SOLUTION:
EXAMPLE PROBLEM #3
An electron is fired horizontally at \(2.5 \times 10^6 m/s\) between two parallel plates, 7.5 cm long, that have an electric field of 130 V/m. Find the velocity of the electron when it leaves the plates.SOLUTION:
Modifié le: jeudi 19 juin 2025, 20:10