QA.24: A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What is the equivalent capacitance of the combination? (a) Slightly greater than the capacitance of the large capac- itor. (b) Slightly less than the capacitance of the large capacitor. (c) Slightly greater than the capacitance of the small capac- itor. M. Rabiu, Page 12 of 23 (d) Slightly less than the capacitance of the small capacitor. (e) None QA.25: A parallel-plate capacitor filled with air carries a charge, Q. The battery is disconnected, and a slab of material with dielectric constant k = 2 is inserted between the plates. Which of the following statements is true? (a) The charge on the plates is doubled. (b) The voltage across the capacitor is doubled. (c) The voltage across the capacitor decreases by a factor of 2. (d) The charge on the plates decreases by a factor of 2. (e) The electric field is doubled. QA.26: A parallel-plate capacitor is charged and then is disconnected from the battery. By what factor does the stored energy change when the plate separation is then doubled?

QA.24: A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What is the equivalent capacitance of the combination? (a) Slightly greater than the capacitance of the large capac- itor. (b) Slightly less than the capacitance of the large capacitor. (c) Slightly greater than the capacitance of the small capac- itor. M. Rabiu, Page 12 of 23 (d) Slightly less than the capacitance of the small capacitor. (e) None QA.25: A parallel-plate capacitor filled with air carries a charge, Q. The battery is disconnected, and a slab of material with dielectric constant k = 2 is inserted between the plates. Which of the following statements is true? (a) The charge on the plates is doubled. (b) The voltage across the capacitor is doubled. (c) The voltage across the capacitor decreases by a factor of 2. (d) The charge on the plates decreases by a factor of 2. (e) The electric field is doubled. QA.26: A parallel-plate capacitor is charged and then is disconnected from the battery. By what factor does the stored energy change when the plate separation is then doubled?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter20: Electric Potential And Capacitance

Section: Chapter Questions

Problem 47P: According to its design specification, the timer circuit delaying the closing of an elevator door is...

See similar textbooks

Similar questions

According to UE=12C(V)2 (Eq. 27.3), a greater capacitance means more energy is stored by the capacitor, but according to UE = Q2/2C (Eq. 27.2), a greater capacitance means less energy is stored. How can both of these equations be correct?
According to its design specification, the timer circuit delaying the closing of an elevator door is to have a capacitance of 32.0 F between two points A and B. When one circuit is being constructed, the inexpensive but durable capacitor installed between these two points is found to have capacitance 34.8 F. To meet the specification, one additional capacitor can be placed between the two points. (a) Should it be in series or in parallel with the 34.8-F capacitor? (b) What should be its capacitance? (c) What If? The next circuit comes down the assembly line with capacitance 29.8 F between A and B. To meet the specification, what additional capacitor should be installed in series or in parallel in that circuit?
When discharging a capacitor, as discussed in conjunction with Figure 21.39, how long does it take for the voltage on the capacitor to reach zero? Is this a problem?
Suppose that the capacitance of a variable capacitor can be manually changed from 100 pF to 800 pF by turning a dial, connected to one set of plates by a shaft from 0° to 180°. With the dial set at 180° (corresponding to C — 800 pF), the capacitor is connected to a 500-V source. After charging, the capacitor is disconnected from the source, and the dial is turned to 0°. If friction is negligible, how much work is required to turn the dial from 180° to 0°?
Why does the labeled capacitance of the capicitor is the same with the computed actual capacitance? What makes them have the same value?
What is the equivalent capacitance of the system and the charge stored in the 3.00 µF capacitor?
Compute for the capacitance, in picofarads, of the cylindrical capacitor of inner and outer radii 2 cm and 9 cm, respectively,using a dielectric of relative permittivity 3.09. The capacitor is 28 long.
A capacitor is constructed with a plate separation of d=0.0002976m and plate area of 0.33m^2.What is the strength of the dielectric (kappa) in the capacitor if the capacitance of the device is 6.102uF when connected to a 33.2V power supply?
What is the equivalent capacitance of a 1 Farad capacitor and a 0.5 Farad capacitor in parallel?
A capacitor (C=540 microF) has a potential deltaV= 80 volts across it. How much energy is stored in the capacitor?
A dielectric slab with thickness d, it is being inserted halfway into the capacitor (covering half the area). What is the equivalent capacitance of the system? Given that d = 0.5 cm , A = 34 cm2, and κ = 4, find the capacitance in pF.
If the capacitance is 47μF, and the voltage difference across the capacitor terminals is 6V, then the charge stored in that capacitor is: