Glencoe Physical Science

Chapter 8: Magnetism and Its Uses

Section 2 Self-Check Quiz-Eng.

1
Electric current passing through a wire produces __________ .
A)a magnetic field around the wire
B)a permanent magnet
C)geographic poles
D)a compass
2
Which of the following best describes an electromagnet?
A)permanent magnet
B)insensitive to electrical currents
C)unchanging magnetic properties
D)temporary magnet
3
What effect does increasing the current flowing in the wire have on an electromagnet?
A)It decreases the strength of the magnetic field.
B)It increases the strength of the magnetic field.
C)It has no effect on the electromagnet.
D)It causes it to become a permanent magnet.
4
Which of the following changes electrical energy into mechanical energy?
A)generator
B)electric motor
C)transformer
D)superconductor
5
Which of the following is a form of electromagnetic induction?
A)producing electric current by moving a magnet through a wire loop
B)using an electromagnet to measure electric current
C)producing mechanical energy by sending electric current through an electromagnet
D)changing electrical energy to mechanical energy that produces sound
6
Which of the following devices produces electric current?
A)generator
B)stereo speaker
C)galvanometer
D)electric motor
7
In order for the electromagnetic coil in a motor to keep turning, the current must __________ .
A)continue flowing in one direction
B)periodically increase in strength
C)change direction
D)flow through an ammeter
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