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70. ★★ The RL circuit in Figure 25-73 consists of an ideal battery; a resistor, R; an inductor, L; and a switch, S, that has three different positions: a, b, and N. Initially, the switch is in position N (the circuit is open). After the circuit switch is moved to position a and time At elapses, the current in the circuit reaches 50% of its maximum value. The switch remains in position a for the time interval 107. After that, the switch is moved into position b. (a) What is the time constant of this RL circuit? (b) What are the values of the electric current in the circuit, the energy density in the coil, and the emf across the coil (i) when the switch has been at position a for a long time? after the switch has moved to position b and 7 seconds have elapsed? after the switch has moved to position b and 37 seconds have elapsed? Support your answers with a graph of the electric cur- rent in the circuit versus time. (ii) (iii) S N b in L R + I 000

70. ★★ The RL circuit in Figure 25-73 consists of an ideal battery; a resistor, R; an inductor, L; and a switch, S, that has three different positions: a, b, and N. Initially, the switch is in position N (the circuit is open). After the circuit switch is moved to position a and time At elapses, the current in the circuit reaches 50% of its maximum value. The switch remains in position a for the time interval 107. After that, the switch is moved into position b. (a) What is the time constant of this RL circuit? (b) What are the values of the electric current in the circuit, the energy density in the coil, and the emf across the coil (i) when the switch has been at position a for a long time? after the switch has moved to position b and 7 seconds have elapsed? after the switch has moved to position b and 37 seconds have elapsed? Support your answers with a graph of the electric cur- rent in the circuit versus time. (ii) (iii) S N b in L R + I 000

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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70. ★★ The RL circuit in Figure 25-73 consists of an ideal battery; a resistor, R; an inductor, L; and a switch, S, that has three different positions: a, b, and N. Initially, the switch is in position N (the circuit is open). After the circuit switch is moved to position a and time At elapses, the current in the circuit reaches 50% of its maximum value. The switch remains in position a for the time interval 107. After that, the switch is moved into position b. (a) What is the time constant of this RL circuit? (b) What are the values of the electric current in the circuit, the energy density in the coil, and the emf across the coil (i) (ii) (iii) when the switch has been at position a for a long time? after the switch has moved to position b and T seconds have elapsed? after the switch has moved to position b and 37 seconds have elapsed? Support your answers with a graph of the electric cur- rent in the circuit versus time. a S N ob R gL
Transcribed Image Text:70. ★★ The RL circuit in Figure 25-73 consists of an ideal battery; a resistor, R; an inductor, L; and a switch, S, that has three different positions: a, b, and N. Initially, the switch is in position N (the circuit is open). After the circuit switch is moved to position a and time At elapses, the current in the circuit reaches 50% of its maximum value. The switch remains in position a for the time interval 107. After that, the switch is moved into position b. (a) What is the time constant of this RL circuit? (b) What are the values of the electric current in the circuit, the energy density in the coil, and the emf across the coil (i) (ii) (iii) when the switch has been at position a for a long time? after the switch has moved to position b and T seconds have elapsed? after the switch has moved to position b and 37 seconds have elapsed? Support your answers with a graph of the electric cur- rent in the circuit versus time. a S N ob R gL
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