A 50 μF capacitor’s initial voltage is 20 V. At ? = 0, a 4.0 kΩ resistor is connected across it.
What is the charge on the capacitor at the instant when I = 2 mA?
You run a 20 V input through a 50 kΩ resistor to charge a 12 μF capacitor. What are your expected values for (a) the time constant τ, (b) the voltage at time equal to the time constant, and (c) the time it takes for the capacitor to reach 90% of full charge?
(a) A capacitor of capacitance 220 μF is connected in series with a 150 kΩ resistor, a switch and an ammeter. A d.c. power supply of negligible internal resistance is connected to the circuit as shown below 1 50 kΩ 220HF A stopclock is started and after 10 seconds the switch S is closed Ammeter readings are noted at regular intervals until a time of 80s is shown on the stopclock. The graph below shows how the current in the...
Consider the circuit shown below with C = 50 μF, ε = 20 V, and R = 4 kΩ. The capacitor is initially uncharged, but switch S is then closed. What is the charge on the capacitor when the current in the circuit is I = 2 mA ?
A 5.00 μF capacitor that is initially uncharged is connected in series with a 6.40 kΩ resistor and an emf source with E= 140 V negligible internal resistance. Just after the circuit is completed, what is the voltage drop across the capacitor? Just after the circuit is completed, what is the voltage drop across the resistor? Just after the circuit is completed, what is the charge on the capacitor? Just after the circuit is completed, what is the current through...
A 4.0 μF capacitor is put across a 12 V battery. After a long time (~20 time constants), the capacitor is disconnected and placed in series through an open switch, with a 250 Ω resistor. (a) Determine the charge on the capacitor before it is discharged. C (b) What is the initial current through the resistor when the switch is closed? A (c) At what time will the current reach 37% of its initial value? s
A 4.0 μF and a 6.0 μF capacitor are connected in series across an 8.0-V DC source. What is the voltage across the 4.0 μF capacitor? ● 8.0V ● 2.7 V 3.6 V ● 4.8 V
An AC source operating at 60-Hz with a maximum voltage of 170 V is connected in series with a resistor (R = 1.2 k Q) and capacitor (C = 2.5 μF). a) What is the maximum value of the current in the circuit? b) What is the maximum values of the potential difference across the resistor and capacitor? c) When the current is zero, what are the magnitudes of the potential difference across the resistor, capacitor and AC source? How much charge is...
An uncharged 1.0-μF capacitor is connected in series with a 23-kΩ resistor, an ideal 7.0-V battery, and an open switch. What is the voltage across the capacitor 11ms after closing the switch? A) 2.6V B) 2.7V C) 1.6V D) 0.62V
A 1.15 μF capacitor, initially charged to 13.5 V , discharges when it is connected in series with a resistor. Part A What resistance is necessary to cause the capacitor to have only 37% of its initial charge 2.00 s after starting? (MΩ ) Part B What is the voltage across the capacitor at t = 5 τ if the capacitor is instead charged by the same battery through the same resistor? (v)
A 2.00-nF capacitor with an initial charge of 5.71 µC is discharged through a 2.41-kΩ resistor. (a) Calculate the current in the resistor 9.00 µs after the resistor is connected across the terminals of the capacitor. (Let the positive direction of the current be defined such that (dQ/dt) > 0.) mA (b) What charge remains on the capacitor after 8.00 µs? µC (c) What is the (magnitude of the) maximum current in the resistor? A