A slab of copper of thickness b is thrust into aparallel-plate capacitor of plate area Aand plate separation d; theslab is exactly halfway between the plates. (a) What is thecapacitance after the slab is introduced? (b) If a potentialdifference V is maintained between the plates, what isthe ratio of the stored energy before to that after the slab isinserted? (c) How much work is done on the slab as it isinserted? (d) Is the slab sucked in or must it be pushed in?Copper is a kind of metal. What is its dielectric constant?
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.
This Site Might Help You. 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...
