# Couple More Questions on Electrostatics

by Fusilli_Jerry89
Tags: couple, electrostatics
 P: 164 1. The problem statement, all variables and given/known data 1) From the observation that there's an electrostatic attraction between object A and B, what's the most you can conclude about the electric charge on A and B? 2) A plastic sphere with a positive charge of 4.8E-19 C is held stationary in a gravitational field of strength 9.8m/s/s by an electric field of strength 1.2E5 N/C. What is the force of gravity of the sphere? 3)How did Benjamin Franklin define a negative charge? 4) Draw a diagram to show the lines of force around a small positive charge. 5) Point P is 3.0 cm away from a small object with a positive charge of magnitude 5.0 muC. What is the electric field strength at point P? 2. Relevant equations F=QE F=kQq/d^2 3. The attempt at a solution 1) One has to be positive and one has to be negative. 2) 1.2E5 N/C=Fg/4.8E-14 N Fg=5.8E-14 N 3) He defined it as having more electrons than protons. 4) 5) QE=(kQq)/r^2 E=(kq)/r^2 E=[(9.0E9)(5.0E-6 C)]/(0.030m)^2 E= 5.0E7 N/C
 Mentor P: 37,655 In the diagram, remember that the lines of the electric field (and hence the lines of force) originate on + charges and terminate on - charges. How would that change your drawing some?
 P: 164 you mean drawing the lines out of the positive charge?
Mentor
P: 37,655

## Couple More Questions on Electrostatics

 Quote by Fusilli_Jerry89 you mean drawing the lines out of the positive charge?
Maybe....

There would be two cases, with variations on those two cases, right? The first would be a simple diplole, where there are two equal charges spaced apart. What would the E field distribution (and therefore the force vector field) look like for that?

The second case is a positive charge embedded in an overall E field that is generated by something external (like a positive ion sitting between the plates of a capacitor). How would that change the E field diagram?

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