Paying 20fg per. Please show your work.

A uniform electric field of 20kV/m points vertically upward.

How far apart are the equipotential planes that differ by 780V ?
Express your answer using two significant figures.



A parallel plate capacitor has a plate area of 0.515m2 and a plate separation of 1.95mm . What is its capacitance?




How much charge flows through a 24-V battery when a 4.0-μF capacitor is connected across its terminals?
Express your answer using two significant figures.




A capacitor has a capacitance of 45pF , which increases to 190pF when a dielectric material is between its plates.
What is the dielectric constant of the material?
Express your answer using two significant figures.

This post was edited by Stolem on Dec 2 2013 02:39pm

You should really ask your professor for help if you do not understand this. At the very least, you should put forth some effort into what you're doing.
I wasn't the best at physics, and at the very least, I wrote out what was given, what was needed. I'm going to put in the general needs, but I won't solve the problems.

1. Electric field is the rate of change of potential. You use E = v/d

2. εo * (A/d)

4. C= (E*a)/d
E = Er x Eo

Thanks.

Last problem.

http://tinypic.com/view.php?pic=29zc2rk&s=5#.Up0HWyd4nHs