- #1
ledwardz
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Homework Statement
A parallel plate capacitor has a charge of 50pC
area = 10mm^2
dielectric material permittivity = 2.5
distance between plates = 0.5 mm
find the electric field
the potential difference between the 2 plates
the energy stored in the capacitor
Homework Equations
electric field = Charge density / permittivity
charge density = q / a
therefore E = 5*10^-3 / 2.5 = 2* 10 ^-3
PD= Ed = 2*10^-3 * 0.005 = 1*10^-5
energy u = 0.5V*q = 0.5 * 1*10^-5* 50*10^-9 = 2.5*10^-13 J
can anyone tell me if this is correct? thanks again for any help. Cheers, Lee:shy: