J
Jon Slaughter
- Jan 1, 1970
- 0
I'm trying out a little experiment but its not working ;/
Since
Q = C*V
and
F = k*Q1*Q2/r^2,
The force one parallel plate capacitor due to the charge is
F = k*(CV)^2/r^2
So for a ceramic capacitor of 20nF with V = 20V, F ~= 3.6N. (assuming r ~=
1mm)
I've tried this with two pennies and a piece of paper(as the
dielectric/insulator) which gives about 20pF and about 1nF(theoretically and
to small for me to measure).
I grinded down one side of 40nF ceramic plate capacitor and a penny and it
has a total of 40nF but I experience no force when moving the plates close
together(which is surely < 1mm). But why? Surely since they act as a 40nF
capacitor and there is 20V across is then there should be a significant
force between the two. A large enough force to feel at when trying to
seperate the two?
But this isn't the case so I must be wrong either in theory or application.
The theory is pretty straight forward and even if my calulations are off by
1000 I probably should feel some force between the two but as far as I can
tell there is nothing. Not sure about the application either as it also is
pretty straight forward(the main problem is getting a large enough
capacitance in a simple way).
Any ideas where I went wrong?
Thanks,
Jon
Since
Q = C*V
and
F = k*Q1*Q2/r^2,
The force one parallel plate capacitor due to the charge is
F = k*(CV)^2/r^2
So for a ceramic capacitor of 20nF with V = 20V, F ~= 3.6N. (assuming r ~=
1mm)
I've tried this with two pennies and a piece of paper(as the
dielectric/insulator) which gives about 20pF and about 1nF(theoretically and
to small for me to measure).
I grinded down one side of 40nF ceramic plate capacitor and a penny and it
has a total of 40nF but I experience no force when moving the plates close
together(which is surely < 1mm). But why? Surely since they act as a 40nF
capacitor and there is 20V across is then there should be a significant
force between the two. A large enough force to feel at when trying to
seperate the two?
But this isn't the case so I must be wrong either in theory or application.
The theory is pretty straight forward and even if my calulations are off by
1000 I probably should feel some force between the two but as far as I can
tell there is nothing. Not sure about the application either as it also is
pretty straight forward(the main problem is getting a large enough
capacitance in a simple way).
Any ideas where I went wrong?
Thanks,
Jon