Class 12 NEET Physics Electrostatics Questions Part 1

Let q be the charge on each capacitor.
∴ Energy stored, U=

1

2

CV2=

1

2

q2

C

Now, when battery is disconnected and another capacitor of same capacity is connected in parallel to the first capacitor, then voltage across each capacitor, V=

q

2C

∴ Energy stored =

1

2

C(

q

2C

)2 =

1

4

.

1

2

q2

C

=

1

4

U