Electrostatic Potential And Capacitance

Physics
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Space between the plates of a parallel plate capacitor is filled with a dielectric slab. The capacitor is charged and then the supply is disconnected to it. If the slab is now taken out , then:

A
work is not done to take out the slab
B
energy stored in the capacitor reduces
C
potential difference across the capacitor is decreased
D
potential difference across the capacitor is increased
Easy
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When air is replaced by a dielectric medium of constant , the capacity of the condenser:

A
increases times
B
increases times
C
remains unchanged
D
decreases times
Easy
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