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Chapter 3
Magnetism
1. The two ends of a
solenoid act likePoles of a magnet
2. Magnetic poles that
are alikeRepel each other
3. You can increase the
strength of an
electromagnet’s field byUsing a stronger
ferromagnetic material for
the core
4. As Earth’s magnetic
poles move, the
magnetic declination in
a given location willChange
5. An electric current
produces aMagnetic field
6. Magnetic poles that
are unlikeAttract each other
7. A device uses to
measure small currents
is aGalvanometer
8. Every magnet,
regardless of its shape,
has twoMagnetic poles
9. What is one difference
between a galvanometer
and an electric motor?
A galvanometer uses an
electric current
10. To reverse the
direction of current in a
motor, current is
conductedThrough the commutator
to the armature
11. What device
transforms electrical
energy into mechanical
energy?
An electric motor
12. Magnetic field lines
around a bar magnetSpread out from one
pole and curve around
another.
13. The type of current
produced by a battery isdirect current
14. A device that
increases or decreases
voltage is called atransformer
15. Electric current from a
generating plant isDirect current transmitted
at high voltages, but
usually used at low
voltages
16. A solenoid with a
ferromagnetic core is
called anelectromagnet
17. A generator
transformsMechanical energy into
electrical energy
18.An magnet is any
material that attracts
iron and materials that
contain iron.
19.A solenoid with a
ferromagnetic core is
called an electromagnet.
20. To generate
electricity at an electric
company, a turbine is
attached to the
armature of a generator.
21. A current consisting
of charges that flow in
one direction only is
called a direct current.
22. A galvanometer is a
device currents that
measures small
magnetic fields.
23. A magnetic field is
produced around a wire
through which a current
flows.
24. A step-up
transformer is a
transformer that
increases voltage.
25. A maglev train floats
above its rails due to
magnetism.
26. The distance that the
pointer of a galvanometer
moves depend on the
amount of currents in the
loops of the armature.
27. When a wire moves
up and down repeatedly
in a magnetic field, an
alternating current is
induced in the wire.
28. An electromagnet is
a strong magnet that can
be turned on and off.
29. When placed near
each other, unlike
magnetic poles attract
each other.
30. A magnetic field is
the region of magnetic
force around a magnet.