Question: Q. 11. A 12p F capacitor is connected to a 50 V battery. How much electrostatic energy is stored in the capacitor? If another capacitor of 6p F is connected in series with it with the same battery connected across the combination, find the charge stored and potential difference across each capacitor.

U [Delhi II 2017]

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Solution:

Ans. Calculation of electrostatic energy in 12p F capacitor

Total charge stored in combination 1

Potential difference across each capacitor 1/2+1/2

Energy stored, in the capacitor of capacitance 12 p F,

U=12CV2 =12×12×1012×50×50 J =1.5×108 J

C= Equivalént capacitance of 12pF and 6pF, in series, is given by

1C=112+16=1+212 C=4pF

Charge stored across each capacitor

q=CV =4×1012×50C =2×1010C

Charge on each capacitor 12p F as well as 6p F

Potential difference across capacitor C1

V1=2×101012×1012 =503 V

Potential difference across capacitor C2

V2=2×10106×1012 =1003 V

[CBSE Marking Scheme 2017]



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