Question: Q. 6. (i) How many electrons must be added to one plate and removed from other so as to store 25.0 J of energy in a 5.0n F parallel plate capacitor ?

(ii) How would you modify this capacitor so that it can store 50.0 J of energy without changing the charge on its plates?

U] [SQP 2017-18]

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Solution:

Ans. (i)

C=5×109F,U=25 J U=Q22C Q2=2UC =2×25×5×109 Q=5.0×104C Q=ne n=Qe=50×104C1.60×1019 =3125×1015 electrons 1/2

(ii) Without changing charge on the plates, we can make C half.

C=ε0Ad

Double the plate separation or inserting dielectric of dielectric constant of a value such that C will become half.

1

CBSE Marking Scheme 2017]



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