a dielectric is inserted between the plates of an isolated parallel - plate capa

Question

a dielectric is inserted between the plates of an isolated parallel - plate capacitor that carries a charge q. what happens to the potential energy stored in the capacitor?

a) the potential energy of the capacitor remains the same.

b) the potential energy of the capacitor increases.

c) the potential energy of the capacitor increases or decreases depending on the value of the dielectric constant of the capacitor.

d) the potential energy of the capacitor decreases.

e) more information is needed to answer the question.

Explanation / Answer

B) The potential energy of the capacitor decreases. because E=Q^2/2c and on inserting dielectric C increases as C=KAE/d therefore potential energy decreases

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