copper is dielectric?

Question

A slab of copper of thickness b is thrust into a
parallel-plate capacitor of plate area A
and plate separation d; the
slab is exactly halfway between the plates. (a) What is the
capacitance after the slab is introduced? (b) If a potential
difference V is maintained between the plates, what is
the ratio of the stored energy before to that after the slab is
inserted? (c) How much work is done on the slab as it is
inserted? (d) Is the slab sucked in or must it be pushed in?

Copper is a kind of metal. What is its dielectric constant?

knr · Accepted Answer

a) the capaciatance with copper plate is  Ccu = eo A / d - b 

b) energy before the slab is kept U1 = 1/2 eo A V^2 / d and after the slab is kept 
                                
                                               U2 = 1/2 eo A V^2 / (d-b)

c) work done W = U2 - U1 = 1/2 eoA V^2 b / d(d-b)

d) it must be pushed in and work is done on it.

copper being a metal its dielectric constant will be infinite.

Anonymous · Answer

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RE:
copper is dielectric?
A slab of copper of thickness b is thrust into a
parallel-plate capacitor of plate area A
and plate separation d; the
slab is exactly halfway between the plates. (a) What is the
capacitance after the slab is introduced? (b) If a potential
difference V is maintained between the plates, what...

copper is dielectric?

2 Answers