GIBILISCO CHAP 8

通報

問題一覧

The geomagnetic field:

C. Is what makes a compass work

Geomagnetic lines of flux:

A. Are horizontal at the geomagnetic equator.

A material that can be permanently magnetized is generally said to be:

D. Ferromagnetic

The force between a magnet and a piece of ferromagnetic metal that has not been magnetized:

B. Is never repulsive.

Magnetic flux can always be attributed to:

C. Motion of charged particles

Lines of magnetic flux are said to originate:

B. At a north magnetic pole.

The magnetic flux around a straight, current-carrying wire:

B. Is strongest near the wire

The gauss is a unit of:

C. Magnetic flux density.

A unit of overall magnetic field quantity is the:

A. Maxwell.

If a wire coil has 10 turns and carries 500 mA of current, what is the magnetomotive force in ampere-turns?

C. 5.0.

If a wire coil has 100 turns and carries 1.30 A of current, what is the magnetomotive force in gilberts?

C. 164

Which of the following is not generally possible in a geomagnetic storm?

D. Disruption of microwave radio links

An ac electromagnet:

B. Will attract pure, unmagnetized iron.

An advantage of an electromagnet over a permanent magnet is that:

A. An electromagnet can be switched on and off.

A substance with high retentivity is best suited for making

D. A permanent magnet.

A relay is connected into a circuit so that a device gets a signal only when the relay coil carries current. The relay is probably:

D. Normally open.

A device that reverses magnetic field polarity to keep a dc motor rotating is:

C. A commutator

A high tape-recorder motor speed is generally used for:

B. Video

An advantage of a magnetic disk, as compared with magnetic tape, for data storage and retrieval is that:

B. Data can be stored and retrieved more quickly with disks than with tapes.

A bubble memory is best suited for:

A. A large computer

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