Chapter 30 Concept Quiz
In the circuit below, the switch has been at position a for a long time. A long time after the switch is moved to position b, what is the current through the resistor?
0
In the circuit below, the switch has been at position b for a long time. Immediately after the switch is moved to position a, what is the current through the resistor?
0
In the circuit below, the switch has been open for a very long time. Immediately after the switch is closed, what is the current through Arm 3 which contains the resistor and the inductor?
0
In most cases, we treat inductors as ideal, which means they have no internal resistance. However, like batteries, real inductors have some internal resistance and like batteries, we can treat the device as an inductor and a resistor in series as shown inside the dashed line in the figure below. In this section of circuit, what would we expect the potential difference between points a and b to be if the current is to the right and decreasing in magnitude?
It is impossible to tell
In the figure below, the current is moving to the left through the inductor and is decreasing in magnitude. Which point is the higher potential point?
Point a
In the figure below, the current is moving to the right through the inductor and is increasing in magnitude. Which point is the higher potential point?
Point a
In the figure below, the current is moving to the left through the inductor and is increasing in magnitude. Which point is the higher potential point?
Point b
In the figure below, the current is moving to the right through the inductor and is decreasing in magnitude. Which point is the higher potential point?
Point b
Solenoid A has twice the length of solenoid B. All other properties are the same. What is the relationship between their inductances?
La = 1/2*Lb
In the circuit below, the switch has been open for a very long time. Immediately after the switch is closed, what is the current through the battery?
V/R1 + V/R2
In an RL-circuit, there is an ideal battery, a resistor, an ideal inductor and a switch. When the switch is closed, current begins to flow and it takes a time t for the current to reach half its maximum amount. If the inductance is decreased by a factor of two, what happens to the number of time constants it takes for the current in the circuit to reach half its maximum amount.
The amount of time constants needed stays the same.
In the circuit below, the switch has been open for a very long time. Immediately after the switch is closed, what is the current through Arm 1 which contains just the resistor?
V/R1
In most cases, we treat inductors as ideal, which means they have no internal resistance. However, like batteries, real inductors have some internal resistance and like batteries, we can treat the device as an inductor and a resistor in series as shown inside the dashed line in the figure below. In this section of circuit, what would we expect the potential difference between points a and b to be if the current is to the left and increasing in magnitude?
delta V > L(dI/dt)
In most cases, we treat inductors as ideal, which means they have no internal resistance. However, like batteries, real inductors have some internal resistance and like batteries, we can treat the device as an inductor and a resistor in series as shown inside the dashed line in the figure below. In this section of circuit, what would we expect the potential difference between points a and b to be if the current is to the right and increasing in magnitude?
delta V > L(dI/dt)
