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Unformatted text preview: d. If the cable was f lled with a dielectric of dielectric constant κ e = 2 . 2 , calculate the stored energy. [4] For the circuit shown, f nd a; the total equivalent capacitance between the terminals b; the charge stored on each capacitor c; the total stored energy. [5] Electric charge is distributed uniformly along a thin rod of length a , with total charge Q. Take the potential to be zero at in f nity. Find the potential at the point P a distance x to the right of the rod [6] A parallelplate capacitor of area A and plate separation d is charged to a potential di f erence V and then is disconnected from the charging source. The plates then are pulled apart until the separation is 2 d . Find expressions in terms of A, d and V for: a; the new capacitance b; the new potential di f erence c; the new stored energy d; How much work was required to change the plate separation from d to 2 d ? 1...
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 Spring '08
 Jordan
 Charge, Work, Electric charge, Coaxial cable, Dielectric, free charge density

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