Electric Potential (Parallel Plate Capacitor PotentialEnergy and Potential)
A parallel plate capacitor has two terminals, one (+)and the other (-). When you move a test positive charge, q atuniform velocity from the negative terminal (Ui and Vi) to thepositive terminal (Uf and Vf), work W = ΔU = qΔV is done on thecharge, increasing the energy of the field by this amount. The workdone by the field on the charge is – W. (V = U/q, all have theirusual meaning)
QUESTIONS on the above observations:
(i) What is the work done to move a negative charge, q atuniform velocity from the positive to the negative terminal?Increasing the potential energy, a push (work) is needed to movethe object.
(ii) Which terminal is the high potential for the pluscharge?
(iii) Which terminal is the high potential for the negativecharge?
(iv) If you do work 1.0 eV to move a proton from the negative tothe positive terminal of a capacitor, how much work will you do tomove an electron in the exact same manner from the positive thenegative terminal of the same capacitor?
(v) What is the potential difference across the abovecapacitor?
