Before you move on, answer the following questions below to reveiw what you've learned in this lesson.
What does the strength of a magnetic field in a current-carrying wire depend on?
Explain the right-hand rule for a current-carrying conductor.
Describe how to create a solenoid.
What is an electromagnet?
How does an electric motor work?
| Your Responses | Sample Answers |
|---|---|
| The strength of the magnetic field through a current-carrying wire is directly proportional to the current through the wire and inversely proportional to the distance from the wire. | |
| The right-hand rule for a current-carrying conductor says that if you make a fist around the wire such that your thumb points in the direction of the current, the direction of the wrapped fingers indicates the direction of the magnetic field around the wire. | |
| A solenoid is created by taking a current-carrying wire and wrapping it into multiple loops that line up in a row. Each loop adds to the magnitude of the magnetic field in the middle of the tube created by the loops. | |
| An electromagnet is created when you put a piece of iron in the middle of a solenoid. The domains in the iron align to create a magnet that is only there when the current is flowing through the solenoid. | |
| Basically, making the loop free-spinning, and alternating the current through the loop (i.e. changing the direction of the current passing through the loop each half-turn) you would create a spinning loop. In effect, you have converted electrical energy into work. | |
