Magnetism

4. A magnetic device created by a combination of a solenoid and ferrous metal.
6. Current created by a moving magnetic field.
7. This device is used in a DC motor to change the direction of current flow and, subsequently, the poles of the armature.
8. The magnetic field created by a current carrying wire or coil is directly proportional to this electrical quantity.
9. The unit of magnetic field strength is named for this inventor.
10. Electric charges can be isolated, but magnetic _____ cannot.
12. A current carrying solenoid creates a magnetic field similar to this object.
14. Your fingers will curl naturally in the direction of the magnetic flux when your thumb is pointed in the direction of conventional current flow.
16. A motor capable of operating on either AC or DC.
19. The “to and fro” movement of a speaker is due to this type of electrical current.
20. Imaginary lines indicating the direction of a magnetic field.

1. The stationary part of a motor or generator.
2. This scientist first discovered the connection between electricity and magnetism.
3. A force field near a magnetic pole.
5. The rotating coil in a generator or motor.
11. The property of metals that can attract iron or steel.
13. A coil of tightly wrapped wire used to create a magnetic field strong enough to move a plunger positioned inside the coil.
15. The armature of this device rotates in a magnetic field converting electrical energy into rotational mechanical energy.
17. This type of motor would be damaged by running it on the wrong frequency.
18. This simple device can be used to detect the presence of a magnetic field.