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Study Material for Class 12 Physics Capacitance
Class 12 Physics students should refer to the following Pdf for Capacitance in Class 12. These notes and test paper with questions and answers for Class 12 Physics will be very useful for exams and help you to score good marks
Class 12 Physics Capacitance
Ex. 1 The capacitor of capacitance 4μF and 6μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. Then the charge on each capacitor is numerically-
(A) 6000 C (B) 1200C (C) 1200 μC (D) 6000μC
Sol. CR =C1C2/C1+C2 + = 2.4 μF
Charge flown through the circuit
= 2.4 × 500 × 10–6C = 1200 μC
Ans.[C]
Ex. 2 Three capacitors are connected to D.C. source of 100 volts as shown in the adjoining figure. If the charge accumulated on plates of C1, C2 and C3 are qa , qb , qc , qd , qe and qf respectively, then
Sol. In series combination, charge is same on capacitor. Ans.[D]
Ex.3 Three capacitors each of capacitance 1μF are connected in parallel. To this combination, a fourth capacitor of capacitance 1μF is connected in series. The resultant capacitance of the system is-
(A) 4μF (B) 2μF (C) 4/3 μF (D) 3/4 μF
Sol. Resultant of parallel combination
= 3 × 10–6 μF Total capacitance of combination is
1/Cr = 1/3 x 10 -6 =4/3 × 106
⇒ Cr =3/4 μF
Ans.[D]
Ex. 4 In the circuit diagram shown in the adjoing figure, the resultant capacitance between P and Q is-
Ex.5 Four condensers each capacity 4μF are connected as shown in figure VP – VQ = 15 volts. The energy stored in the system is-
(A) 2400 ergs (B) 1800ergs (C) 3600 ergs (D) 5400 ergs
Sol. Total capacitance of given system]
1/ CR= 5/8 ⇒ CR = 8/5 μF
Energy stored =1/2 CRV2
= 1/2 ×8/ 5× 10–6 × 225
= 180 × 10–6 joule
= 180 × 10–6 × 107 ergs
= 1800 ergs
Ans.[B]
Ex.6 Two capacitors each of 0.5 μF capacitance are connected in parallel and are then charged by 200 volts. D.C. supply. The total energy of their charges (in joules) is-
(A) 0.01 (B) 0.02
(C) 0.04 (D) 0.06
Ex.8 Four capacitors are connected as shown in the adjoining figure. The potential difference between A and B is 1500 volts. The energy stored in 2μF capacitance will be-
Ex.9 Four capacitors of each capacity 3μF are connected as shown in the adjoining figure. The ratio of equivalent capacitance between A and B and between A and C will be-
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CBSE Class 12 Physics Capacitance Study Material
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Study Material for Physics CBSE Class 12 Capacitance
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Capacitance Study Material Physics CBSE Class 12
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Capacitance CBSE Class 12 Study Material Physics
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CBSE Study Material Physics Class 12 Capacitance
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