   Chapter 20, Problem 10CQ

Chapter
Section
Textbook Problem

The switch S in Figure 20.27 is closed at t = 0 and the current at a reference time tref> 0 is Iref. If the circuit is changed as, described below and the switch is again dosed at t = 0, determine whether the current I at the same time would be greater than, less than, or equal to the original value of Iref. Indicate your answers wilt G. L. or E, respectively. (a) Both the battery voltage ε and the resistance R are doubled. (b) The inductance L b doubled. (c) The battery voltage ε. the resistance R, and the inductance L are each doubled. Figure 20.27 A series RL circuit. As the current increases toward its maximum value, the inductor produces an emf that opposes the increasing current.

(a)

To determine
To compare the currents in the circuit as a result of the changes in circuit

Explanation

The relation between current and time constant in a inductance resistance circuit is given by I=εR(1e(tτ)) where τ is the time constant which is given by <

(b)

To determine
To compare the currents in the circuit as a result of the changes in circuit

(c)

To determine
To compare the currents in the circuit as a result of the changes in circuit

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