Electrostatics Question 644

Question: The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively C0 and W0 . If the air is replaced by glass (dielectric constant = 5) between the plates, the capacity of the plates and the energy stored in it will respectively be

Options:

A) 5C0,5W0

B) 5C0,W05

C) C05,5W0

D) C05,W05

Show Answer

Answer:

Correct Answer: B

Solution:

[b] When a dielectric K is introduced in a parallel plate condenser its capacity becomes K times.

Hence C=5C0

Energy stored W0=q22C0

W=q22C=q22×5C0W=W05



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