Column-I

Column-II

(i) When a dielectric

slab is gradually

inserted between the

plates of an isolated

parallel plate charged

capacitor

[A] The electric

potential energy of the

system decreases

(ii) When a dielectric

slab is gradually

inserted between the

plates of a parallel plate

capacitor & its potential

is kept constant by

connecting battery

[B] Work done by

external agent is

positive

(iii) When the plates of

a parallel capacitor are

pulled apart, keeping its

potential constant by

connecting battery

[C] Work done by

battery is positive

(iv) When the plates of

a parallel plate

capacitor are pulled

apart, keeping its charge

constant by

disconnecting battery

[D] Work done by

external agent is

negative