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This text is meant to accompany class discussions. It is not everything there is to know about uniform circular motion. It is meant as a prep for class. More detailed notes and examples are given in the class notes, presentations, and demonstrations (click here.)

Click for the questions that go with this reading

Electric Potentials in Uniform Fields

This video will start with gravitational fields for examples of equipotential fields. When you have finished viewing it you should be able to

Define, "equipotential"
Describe the relationship between potentials and potential energy.
Describe the direction of e-files compared the equipotential.
Define when work is done in relation to equipotential lines.
Define an, "equipotential surface."

This video can be found on YouTube at https://youtu.be/Qv6JPH8PKac

The video below is follow up to the previous video. It relates gravitational potentials to electric potentials. When you have finshed you should be able to:

Define an equipotential line.
Define the direction of the electric field compared to the electric potentials.
Define the direction of the electric field's direction in realtion to the electric potentials.
Describe when work is done as positive or negative charges move between equipotential lines.
Compare the electric field strengths between the equipotential lines.

This video can be found on YouTube at https://youtu.be/Oq1B1vUbuLk

Example 1

Question
Solution
Video Solution

A 9x10^-16 kg particle of +5 nC approches a negative charge of -10nC. It travels from a potential of -45V to -182V. If the initial speed was 1000 m/s, what is the particle’s final speed?

This video can be found on YouTube at https://youtu.be/cG7EnwMKzGI

Example 2

Question
Solution
Video Solution

A charged particle has the shown potentials. What is the e-feild between the first two potentials?

This video can be found on YouTube at https://youtu.be/uwdGUnqIyfI

Example 3

Question
Solution
Video Solution

Which location, A, B, or C, has the largest e-field magnitude?

V=Ed
E=V/d
The potential difference between the equipotential lines on bost sides of each location is 10 V.

A - 30V-20 =10 V
B - 50 V- 40 V = 10 V
C - 60 V - 50 V = 10 V

Therefore the e-feild is proprtional to the inverse of the distance. The lines around "C" are the closest to each other.

This video can be found on YouTube at https://youtu.be/Bq_eHoUc0-c

Example 4

Question
Solution
Video Solution

What is the e-field between the two plates connected to the 90V battery?

This video can be found on YouTube at https://youtu.be/g7AOexPIwAU

Example 5

Question
Solution
Video Solution

What is the direction of the e-field?

This video can be found on YouTube at https://youtu.be/JfZJn8cWM_k

Example 6

Question
Solution
Video Solution

What is the direction of the force to move a positive charge? How would the directions of the force differ if the charge was negative?

These are the directions for positive particles. The forces point in the same direction as the e-field because F=qE. Negative charges will feel a force in the opposite direction of the positive charge.

This video can be found on YouTube at https://youtu.be/Y9nRD0NgKuw

Summary

Summary
Video Summary

This video can be found on YouTube at https://youtu.be/yyFSAVJaejU

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by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)