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CBSE Class 12 Physics 2017 Delhi Set 1 Paper

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Question : 17 of 26
Marks: +1, -0
(i) Find equivalent capacitance between A and B in the combination given below. Each capacitor is of 2µF capacitance.

(ii) If a dc source of 7V is connected across AB, how much charge is drawn from the source and what is energy stored in the network?
Solution:  
(i) Calculation of equivalent capacitance
(ii) Calculation of charge and energy stored
(i) Capacitors C2,C3 and C4 are in parallel
∴‌C234=C2+C3+C4
∴‌C234=6µF
Capacitors C1,C234 and C5 are in series
‌
1
Ceq
=‌
1
C1
+‌
1
C234
+‌
1
C5
 =‌
1
2
+‌
1
6
+‌
1
2
‌=‌
7
6
µF
Ceq‌=‌
6
7
µF
(ii) Charge drawn from the source
Q‌=CeqV,
‌=‌
6
7
×7µC=6µC
Energy stored
U‌=‌
Q2
2C

‌=‌
6×6×10−12×7
2×6×10−6
=21µJ
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