1.
|
|
The animation shows a top view of four wires and a galvanometer in the lab. Current flowing into the + terminal, i.e., counterclockwise, will deflect the meter to the right. During the time interval t=2 s to t=8 s a magnet is slowly pushed completely through the rectangle from the bottom toward the top. (You can also think of the magnet as being pushed out of the computer monitor toward the user.) Observe the meter reading during this simulation. Which pole was inserted first? North or south? The animation starts at t=0 and stops at t=10 seconds. Start.
|
| North. |
| South |
|
2.
|
|
The animation shows a top view of four wires and a galvanometer. There is a constant magnetic field passing through these wires. Determine the direction of this magnetic field by click-dragging the black wire back and forth and observing the galvanometer reading. Remember that current flowing into the + terminal, i.e., counterclockwise, will deflect the meter to the right. Start.
|
| Toward the top. That is, out of the computer monitor. |
| Toward the bottom. That is, into the computer monitor. |
|
3.
|
|
The wire on the right is pulled to the right for 5 seconds and then to the left for 5 seconds as shown. Determine the magnitude of the magnetic field passing through the wire rectangle. You may pause the simulation and read coordinate values by click-dragging the mouse at any time. The meter displays the induced emf in millivolts. Start. More Help. Plot the input and output voltage as functions of time.
|
| 1 milli-Tesla |
| 2 milli-Tesla |
| 3 milli-Tesla |
| 4 milli-Tesla |
|
4.
|
|
A transformer is connected to a wall socket as shown. How many turns are there in the transformer secondary if the transformer primary has 300 turns? You can read component values by placing the mouse over a component. Start. More Help. Plot the input and output voltage as functions of time.
|
| 50 turns. |
| 70 turns. |
| 300 turns. |
| 1800 turns. |
|
5.
|
|
A load is connected to a transformer as shown. What how much rms current flows from the wall plug? You can read component values by placing the mouse over a component. Start. More Help.
|
| 0.2 A |
| 2 A |
| 20 A |
|
6.
|
|
The circuit above is programmed to display values at 10 ms, 20 ms, 30 ms, and 40 ms after the switch is closed. You may read these values by resting the mouse cursor on the component What is the inductance of the coil, L?.
|
| 40 mH. |
| 60 mH. |
| 80 mH. |
| 100 mH |
|
7.
|
|
An unknown device is connected to an AC voltage source as shown. Identify the type of device. Start.
|
| A resistor. |
| A capacitor. |
| An inductor. |
| None of the above. |
|
8.
|
|
A capacitor is connected to an AC voltage source as shown. Find the capacitance. Start. More Help.
|
| 3.2 mF |
| 20 mF |
| 160 mF |
| 370 mF |
|
9.
|
|
A coil is connected to an AC voltage source as shown. What is the inductance of the coil? Start. More Help.
|
| 5 mH |
| 10 mH |
| 15 mH |
| 20 mH |
|
10.
|
|
An RC circuit uses a capacitor and resistor connected to an AC source as shown above. The voltages across the resistor and capacitor not seem to equal the source voltage, 10 V, at 300 Hz. That is, Vr + Vc =Vs does not seem to be true in this circuit. Does this violate Kirchhoff's loop rule for voltage? Start. More Help.
|
| Kirchhoff's loop rules applies only to DC voltage sources. |
| RMS values must be used when applying Kirchhoff's rules. |
| Kirchhoff's rules only apply to resistors. |
| Kirchhoff's rules apply to instantaneous values. |
|
11.
|
|
A LRC is shown above. You can measure circuit values by placing a mouse on a component. Which circuit values are correct?
|
| Circuit values. |
| Circuit values. |
| Circuit values. |
| Circuit values. |
|
12.
|
|
Determine the rms power being dissipated in the LRC circuit at 200 Hz. Start. More Help.
|
| 1.8 W |
| 2.6 W |
| 3.7 W |
| 5.2 W |
|
13.
|
|
Find the resonant frequency of the LRC circuit. Start.
|
| 400 Hz |
| 425 Hz |
| 450 Hz |
| 475 Hz |
