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Important questions on Parallel Plate Capacitor

In a parallel plate capacitor, the region between the plates is filled by a delectric slab. The capacitor is connected to a cell and the slab is taken out.    

A
Some charge is drawn from the cell
B
Some charge is returned to the cell
C
The potential difference across the capacitor is reduced
D
No work is done by an external agent in taking the slab out
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The plates of a parallel-plate capacitor are not exactly parallel. The surface charge density, therefore,

This question has multiple correct options
A
is smallest where the plates are closet
B
is higher at the closer end
C
will not be uniform
D
each plate will have the same potential at each point
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For high frequency a capacitor offer

A
more reactance
B
less reactance
C
zero reactance
D
inifinite reactance
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