# Problem on capacitors.

1. May 5, 2008

### TPDC130

1. The problem statement, all variables and given/known data
Given an electric potential of Vo*sin(wt). This is applied to a parallel plate capacitor of area S, separation d and capacitance C. The questions are
a) What is charge Q on the plates?
b) Find the electric displacement current
c) Calculate the current in the wire.

2. Relevant equations
a) Q=CV
b) I=(epsilon)*d(phi)/dt
c) i=dQ/dt

3. The attempt at a solution

for part a, i got Q=CV=C*Vo*sin(wt)
for part b, i got I=(epsilon)*w*cos(wt)
for part c, i got i=C*w*cos(wt)

is this right, because i have a feeling that this is a little too easy of an answer.
why does the displacement current differ from the current in the wire?

2. May 5, 2008

### R A V E N

Rewrite that with $$\LaTeX$$ code,I think its easy as it can be.

Its pain to read like that.