# Thread: complex integral in physics question..

1. ## complex integral in physics question..

there is capacitor which square plates ,each side has length L
distance between the plates is d.
we insert a dialectric plate. with dielectric constant $e_r$

our capacitor is connected to ressistor and in a row
and a contant voltage sourse .
we how one loop
battery ressistor and cappacitor.

find the work need to be done in the dielectric plate to move it with some x distance forward.

how i tried to solve it:

work is integral of force by distantace
but we were not given force.

so our work is the sum of two things
1.difference netween energys of the capacitor
2.work of the corrent on the ressistor

the problem is that that
the integral is over time but our cappacitace dependant on distace
and i cant put capacitace as a constant because it canging

and i dont have the kink betweeb distance and time
there is no speed
and
i searched google for days abour a similar problem
and i cant find one

2. ## Re: complex integral in physics question..

Originally Posted by transgalactic
there is capacitor which square plates ,each side has length L
distance between the plates is d.
we insert a dialectric plate. with dielectric constant $e_r$

our capacitor is connected to ressistor and in a row
and a contant voltage sourse .
we how one loop
battery ressistor and cappacitor.

find the work need to be done in the dielectric plate to move it with some x distance forward.

how i tried to solve it:

work is integral of force by distantace
but we were not given force.

so our work is the sum of two things
1.difference netween energys of the capacitor
2.work of the corrent on the ressistor

the problem is that that
the integral is over time but our cappacitace dependant on distace
and i cant put capacitace as a constant because it canging

and i dont have the kink betweeb distance and time
there is no speed
and
i searched google for days abour a similar problem
and i cant find one

I think this question might better belong in the Physics Forum.
Nemesis