Author Question: A series LR circuit contains an emf source of 14V having no internal resistance, a resistor, a 34 H ... (Read 33 times)

Starlight · **on:** Jul 29, 2018

A series LR circuit contains an emf source of 14V having no internal resistance, a resistor, a 34 H inductor having no appreciable resistance, and a switch.

If the emf across the inductor is 80 of its maximum value 4.0 s after the switch is closed, what is the resistance of the resistor?
A) 14
B) 1.9
C) 1.5
D) 5.0

Question 2

What resistance should be added in series with a 3.0-H inductor to complete an LR circuit with a time constant of ?

A) 0.75 k
B) 12
C) 0.75
D) 2.5