Tiêu đề Capacitance (ALL DPPs).pdf ✅

vh   Digital Pvt. Ltd. [1] Capacitance 1. A capacitor of capacitance C is charged to a potential V. The flux of the electric field through a closed surface enclosing the capacitor will be (1) zero (2) infinite (3) positive (4) Negative 2. A capacitor of capacitance C has a charge Q. The net charge on the capacitor is always (1) zero (2) infinite (3) positive (4) Negative 3. A capacitor gets a charge of 50  C when it is connected to a battery of emf 5 V. Calculate the capacity of the capacitor. (1) 5  F (2) 10  F (3) 50  F (4) 100  F 4. When 2 × 1016 electrons are transferred from one conductor to another, a potential difference of 10 V appears between the conductors. Calculate the capacitance of the two conductors system. (1) 2.3 × 10–3 F (2) 2.3 × 10–4 F (3) 3.2 × 10–3 F (4) 3.2 × 10–4 F 5. The graph shows the variation of voltage V across the plates of two capacitors A & B with charge Q. Which of the two capacitors has larger capacitance ? (1) CA = CB (2) CA < CB (3) CA > CB (4) None of these Concept of Capacity, Capacitors and Capacitance DPP-01 TG: @Chalnaayaaar
vh   Digital Pvt. Ltd. [2] Capacitance 6. For flash pictures, a photographer uses a 30 μF capacitor and a charger that supplies 3 × 103 volt. Calculate the charge spent for each flash. (1) 0.07 C (2) 0.09 C (3) 0.08 C (4) 0.06 C 7. Two capacitors C1 and C2 have equal amount of energy stored in them. What is the ratio of potential differences across their plates? (1) 1 1 2 2 V C V C = (2) 1 2 2 1 V C V C = (3) 1 2 2 1 V C V C = (4) 1 1 2 2 V C V C = TG: @Chalnaayaaar
vh   Digital Pvt. Ltd. [3] Capacitance Answer Key Question 1 2 3 4 5 6 7 Answer 1 1 2 4 3 2 3 SOLUTIONS - 01 1. (1) Zero 2. (1) Zero 3. (2) Capacity of the capacitor 6 Q 50 10 C 10 F V 5 −  = = =  4. (4) C = 16 19 Q 2 10 1.6 10 V 10 −    = = 3.2 × 10–4 F 5. (3) A Because Q C V slope 1 =   CA > CB 6. (2) Q = CV = 0.09 C 7. (3) According to question 2 2 1 1 2 2 1 1 C V C V 2 2 = 1 2 2 1 V C V C = TG: @Chalnaayaaar
vh   Digital Pvt. Ltd. [4] Capacitance 1. The capacitance C of a capacitor is :- (1) independent of the charge and potential of the capacitor. (2) dependent on the charge and independent of potential. (3) independent of the geometrical configuration of the capacitor. (4) independent of the dielectric medium between the two conducting surfaces of the capacitor. 2. To increase the charge on the plate of a capacitor implies to :- (1) decrease the potential difference between the plates. (2) decrease the capacitance of the capacitor. (3) increase the capacitance of the capacitor. (4) increase the potential difference between the plates. 3. The earth has Volume 'V' and Surface area 'A' ; then its capacitance would be : (1) 0 A 4 V  (2) 0 V 4 A  (3) 0 V 12 A  (4) 0 A 12 V  4. Capacitors are used in electrical circuits where appliances need rapid : (1) Current (2) Voltage (3) Watt (4) Resistance 5. Which of the following is called electrical energy tank? (1) Resistor (2) Inductance (3) Capacitor (4) Motor Capacity of an Isolated Conductor and Spherical Capacitor DPP-02 TG: @Chalnaayaaar