Download Conceptual Questions 1. What happens when you break a bar

Forces 10.0 - Magnetism Review
Name: ___________________
Conceptual Questions
1. What happens when you break a bar magnet in half? Explain.
2. Where do magnetic field lines begin? Where do they end? Explain.
3. An unmagnetized nail will not attract an unmagnetized paper clip. However, if one
end of the nail is in contact with a magnet, the other end will attract a paper clip.
Explain.
4. A student has placed two cylindrical permanent magnets
on a rod as shown. If she adds another identical magnet
on the top with the same orientation, the space between
the magnets will
a) increase because the magnetic force has doubled.
b) decrease because the gravitational force has doubled.
c) stay the same because both forces have doubled.
d) decrease because the gravitational force increased more than the magnetic.
e) increase because the magnetic force increased more than the gravitational.
5. A hiker is standing directly east of a vertical pole, holding a
magnetic compass, as shown. The compass is pointing north.
Unknown to the hiker, a strong flow of electrons is turned on such
that the electrons flow upwards through a conductor embedded in
the pole. What happens to the compass needle?
a) The needle continues to point north.
b) The needle swings to point south.
c) The needle swings to point west, towards the pole.
d) The needle swings to point east, away from the pole.
6. Two parallel wires are carrying electrical current flowing in the same direction.
These wires will tend
a) to repel each other.
b) to exert no force on each other.
c) to spin along their long axis.
d) to attract each other.
e) to twist at right angles to each other.
Forces 10.0 - Magnetism Review
Name: ___________________
Problems
7. Six magnets slide easily on a track, and settle into the arrangement shown in the
diagram. The south pole of one magnet is labelled (S). Identify the identified poles
below as either north or south.
A ________
D ________
B ________
E ________
C ________
8. Sketch the total magnetic field produced by the three magnets below
N
S
N
N
S
S
N
N
S
S
9. Sketch the magnetic field produced by each of the following current-carrying
conductors below.
a)
b)
c)
I
10.An electric current is travelling southward in a straight, horizontal conductor.
State the direction of the magnetic field
Below the conductor ______________
Above the conductor ______________
East of the conductor ______________ West of the conductor ______________
Forces 10.0 - Magnetism Review
Name: ___________________
11.Identify each end of the solenoids below as either N or S and sketch their
magnetic fields.
a)
b)
c)
I
I
I
12.Indicate the direction of the current for each end of the solenoids below.
a)
b)
c)
S
N
N
13.Indicate the direction of the force on the current-carrying conductor(s) below.
a)
b)
c)
B
I
N
S
I
Forces 10.0 - Magnetism Review
14.Indicate the
a) direction of the current
B
F
Name: ___________________
b) poles of the magnet
c) direction of B
F
F
e- flow
15. An electron, travelling east, enters a magnetic field which is directed upwards.
Sketch the situation below as well as the direction the electron will be deflected
as it enters the magnetic field.
16. Three particles, a, b and c enter the magnetic field below. What can you say
about the charge of each particle?
a
a, b, c
b
c