Asingle capacitor is charged up and then isolated with potential v0. a dielectric, κ = 3, is placed
between its two plates, which of the following terms are correct for this ‘new’ capacitor (pick more
than one)
a. c = 1/3 c0 b. c = 3 c0 c. v = 1/3 v0 d. v = 3 v0
e. q = 1/3 q0 f. q = 3q0 g. e = 1/3 e0 h. e = 3 e0

option (b), (c), (g)

Explanation:

When the battery is disconnected, the charge on the plates of a capacitor remains same.

As the capacitance of the capacitor is directly proportional to the dielectric constant.

C = k C0

Now the charge remains same, So

Q = Q0

Q = k C0 x V0 / k

So, potential between the plates is V0 / k.

Energy, E = 1/2 x C X V^2 = 1/2 x k C0 x V0^2 / k^2 = E0 / k

So, energy becomes E0 / k.

hypothesising or postulating