Download potential

Journal 3/2/17
Recap your notes from yesterday
Objective
To practice the concepts
learned yesterday
Tonight’s Homework
none
Electric Potential Practice Problems
1) We have 2 charges as shown below. At which point A, B, or
C (or D: none of them) is the electric field zero? Prove it!
 Where (if anywhere) in problem #1 is the electric potential zero?
2) A drop of ink carries a charge of 1.6 x 10-10 C and is deflected in an electric
field with a force of 3.2 x 10-4 N. What is the strength of this field?
3) A lightning bolt uses 200 million joules of energy. If this bolt carries 2 C of
charge, what is the voltage of the bolt?
4) How can electric field lines show the strength of an electric field?
5) The Earth has an electric field with a strength of 1000 N/C. This field points
inward toward the center of the Earth. Is the Earth positively or negatively
charged?
6) Find the voltage change when an electric field
does 12 J of work on a 0.0001 C charge.

Which direction is the electric field pointing
at the black dot in the 2 examples at right?