Q.

A thick conducting slab is introduced between the plates of an isolated charged capacitor to fill the free space partially and without touching any plate. Which of the following is wrong statement regarding the points inside the capacitor

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a

Total electrostatic energy of the capacitor will decrease

b

Electrostatic energy density at some points will change and that at some points remains unchanged

c

Electric field is zero at all the points

d

Electric field at some points will change and at some points remains unchanged

answer is B.

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Detailed Solution

Electric field inside the conductor is zero but not zero in the gap between the conductor and the capacitor plates. 

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