19. 18. This is made possible when a
conductor, such as coil of wire
rotates in a magnetic field.
A. Electromagnetism
B. Friction
C. Photoelectric
D. Chemical action
20. 19. Certain materials are rubbed
against each other to produce
charges.
A. Electromagnetism
B. Friction
C. Photoelectric
D. Chemical action
21. 20. Certain materials emit their
electrons when they are exposed
to light under right conditions.
A. Electromagnetism
B. Friction
C. Photoelectric
D. Chemical action
22. 21. There is a breaking up of atomic
structure of some elements, thus
releasing a great amount of energy.
A. Piezo-electric
B. Photoelectric
C. Nuclear Method
D. Thermoelectric
23. 22. Uses certain materials, which
when made to vibrate, produce
voltage.
A. Piezo-electric
B. Photoelectric
C. Nuclear Method
D. Thermoelectric
24. 23. This method utilizes
materials that release electrons
when heated enough.
A. Piezo-electric
B. Photoelectric
C. Nuclear Method
D. Thermoelectric
25. 24. An object that attracts metals
such as iron and steel.
a. Magnet
b. magnetic field
c. Pole
d. attract
26. 25. The space around a magnet in
which a magnetic force can be
found.
a. Magnet
b. magnetic field
c. Pole
d. attract
27. 26. The end of a magnet.
a. Magnet
b. magnetic field
c. Pole
d. attract
28. 27. To pull toward one another, as
opposite poles of two magnets pull
toward one another.
a. Magnet
b. magnetic field
c. Pole
d. attract
29. 28. A form of the mineral magnetize
that is naturally magnetic or has
become magnetized.
a. Lodestone
b. Compass
c. magnetic field
d. pole
30. 29. An instrument that uses a
freely moving magnetic needle to
indicate direction.
a. Lodestone
b. Compass
c. magnetic field
d. pole
31. 30. A piece of iron that becomes a
temporary magnet when electricity
flows through an insulted wire
wrapped around it.
a. Lodestone
b. Compass
c. magnetic field
d. electromagnet
32. Test 2
a. Give the steps in making the electromagnet (5 points)
1.
2.
3.
4.
5.
b. Draw the electromagnet project(5 points)
.