Question: Q. 5. A parallel plate capacitor of capacitance C is charged to a potential V by a battery. Without disconnecting the battery, the distance between the plates is tripled and a dielectric medium of κ=10 is introduced between the plates of the capacitor. Explain giving reasons, how will the following be affected :

(i) capacitance of the capacitor

(ii) charge on the capacitor, and

(iii) energy density of the capacitor.

U] [O.D. (Compt) I, II, III 2017]

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Solution:

Ans. Effect on capacitance

Effect on charge

Effect on energy

(i)

C=ε0Ad C=κε0Ad=10ε0A3d=1/23e1/21

(ii) V remains same since battery is not disconnected

Q=EV=103CV=103Q

(iii) Energy density, $4{ }{T}=\frac{1}{2} \varepsilon{0} E^{2}$

E=(V)d Ud=12κε0E2 =102ε0(Vd)2 =109(12ε0E2) =109Ud

[CBSE Marking Scheme 2017]



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