Exam 29: Direct Current Dc Circuits

The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest.

If ε = 8.0 V, at what rate is that emf providing energy to the circuit shown below?

A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is

What is the magnitude of the current in the 20-Ω resistor?

A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?

At what rate is thermal energy generated in the 5-Ω resistor when ε = 24 V?

A resistor of unknown resistance and a 15-Ω resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?

Determine the potential difference, VA − VB, in the circuit segment shown below when I = 2.0 mA and Q = 50 μC.

Determine the magnitude and sense (direction) of the current in the 500-Ω resistor when I = 30 mA.

The algebraic sum of the changes of potential around any closed circuit loop is

A series circuit consists of a 100-V DC power source, a 100-Ω resistor, and a variable resistor of resistance R, which varies from 0 to 100 Ω. The current in the circuit is ​ ​

If R = 3.0 kΩ, C = 6.0 nF, ε 1 = 10.0 V, Q = 18 nC, ε 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb − Va?

How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?

Determine R when I = 0.20 A and ε = 18 V.

If ε 1 = 4.0 V, ε 2 = 12.0 V, R1 = 4 Ω, R2 = 12 Ω, C = 3 μF, Q = 18 μC, and I = 2.5 A, what is the potential difference Va − Vb?

In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because

If R = 3.0 kΩ, C = 5.0 mF, ε = 6.0 V, Q = 15 mC, and I = 4.0 mA, what is the potential difference Vb − Va?

If R = 4.0 kΩ, C = 3.0 mF, ε = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb − Va?

The capacitors are completely discharged in the circuit shown below. The two resistors have the same resistance R and the two capacitors have the same capacitance C. After the switch is closed, the current

The circuit below contains three 100-W light bulbs and a capacitor. The emf ε = 110V. At the instant the switch S is closed, which light bulb is brightest?