Author Question: A 45-mH ideal inductor is connected in series with a 60- resistor through an ideal 15-V DC power ... (Read 72 times)

Awilson837 · **on:** Jul 29, 2018

A 45-mH ideal inductor is connected in series with a 60- resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?

A) 250 mA
B) 650 mA
C) 550 mA
D) 280 mA
E) 850 mA

Question 2

A series LR circuit contains an emf source of having no internal resistance, a resistor, a inductor having no appreciable resistance, and a switch.

If the emf across the inductor is of its maximum value after the switch is closed, what is the resistance of the resistor?
A) 14
B) 1.9
C) 1.5
D) 5.0