1. The presence of a magnetic force field may be detected by using
(a) A compass.
(b) Iron filings.
(c) A magnet.
(d) All of the above.
2. The deflection of a compass needle placed near a current-carrying wire shows
(a) The magnetic field of the sun.
(b) The magnetic field of the wire.
(c) The electric field.
3. Ampère’s rule relates
(a) The strength of a magnetic field to the magnetic pole.
(b) The direction of a magnetic field surrounding a current-carrying wire.
(c) The direction of a magnetic field near a bar magnet.
(d) None of the above.
(e) All of the above.
4. The unit used to express the strength of a magnetic field is the ________.
5. Describe how a strong magnetic field can be produced in a solenoid.