Electrostatics Question 35

Question: The distance between the plates of a parallel plate condenser is 8mm and P.D. 120 volts . If a 6mm thick slab of dielectric constant 6 is introduced between its plates, then

Options:

A) The charge on the condenser will be doubled

B) The charge on the condenser will be reduced to half

C) The P.D. across the condenser will be 320 volts

D) The P.D. across the condenser will be 45 volts

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Answer:

Correct Answer: D

Solution:

If nothing is said, it is considered that battery is disconnected.

Hence charge remain the same Also Vair=σε0×d

and Vmedium=σε0(dt+tk)

therefore VmVa=(dt+tk)d

therefore Vm120=(86+66)8

therefore Vm = 45V



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