Workbook 4.7 Solutions
4.7 Review
1.
In Alberta the north end of a compass needle points to (approximately) the geographic
a.
north
b.
south
c.
east
d.
west
2.
An negatively charged droplet travels at a speed of 2.0 x 103 m/s. The field(s) that acts on this droplet is/are
a.
electrical only
b.
electrical and magnetic only
c.
magnetic and gravitational only
d.
electrical, magnetic, and gravitational
3.
A charged particle experience a magnetic force only when it
a.
moves in the same direction as the magnetic field
b.
crosses magnetic field lines
c.
goes against gravity
d.
moves against an electric field
4.
A proton beam travels at a constant velocity to the right as shown below. Use a drawing to help describe the magnetic field created by the beam. [Appendix A] p+ 5.
The electromagnet on the right has its poles as labelled.
a. Draw in the battery (between terminals A and B) so that the magnet’s polarity will be as shown in the diagram. [Appendix A]
b. Draw the magnetic field lines produced around the electromagnet.
[Appendix A]
© Kennedy/Oswald 2008
11
S
N
A
B
A
6.
Three particles (A is a neutron, B is an electron and C is a proton), enter a magnetic field (B) at the same speed as shown in the diagram. Identify the direction the particle will be forced. Explain your choice. [Appendix A]
C
B
A – none (neutral)
B- none (not crossing any field lines)
C – Forced out of the page
7.
Determine the magnetic field strength acting on a positron travelling at 7.31 x 107 m/s experiences a magnetic force of 5.38 x 10-13 N. [0.0460T]
The magnetic field strength is 0.0460T.
8.
A beam of alpha particles is accelerated across a potential difference of 7.50 KV. They are then passed perpendicularly through a magnetic field and turn a circle with a radius of 15.1 cm.
Determine the magnetic field strength. [0.117 T]
The magnetic field strength is 0.117 T.
© Kennedy/Oswald 2008
12
B
1.
In Alberta the north end of a compass needle points to (approximately) the geographic
a.
north
b.
south
c.
east
d.
west
2.
An negatively charged droplet travels at a speed of 2.0 x 103 m/s. The field(s) that acts on this droplet is/are
a.
electrical only
b.
electrical and magnetic only
c.
magnetic and gravitational only
d.
electrical, magnetic, and gravitational
3.
A charged particle experience a magnetic force only when it
a.
moves in the same direction as the magnetic field
b.
crosses magnetic field lines
c.
goes against gravity
d.
moves against an electric field
4.
A proton beam travels at a constant velocity to the right as shown below. Use a drawing to help describe the magnetic field created by the beam. [Appendix A] p+ 5.
The electromagnet on the right has its poles as labelled.
a. Draw in the battery (between terminals A and B) so that the magnet’s polarity will be as shown in the diagram. [Appendix A]
b. Draw the magnetic field lines produced around the electromagnet.
[Appendix A]
© Kennedy/Oswald 2008
11
S
N
A
B
A
6.
Three particles (A is a neutron, B is an electron and C is a proton), enter a magnetic field (B) at the same speed as shown in the diagram. Identify the direction the particle will be forced. Explain your choice. [Appendix A]
C
B
A – none (neutral)
B- none (not crossing any field lines)
C – Forced out of the page
7.
Determine the magnetic field strength acting on a positron travelling at 7.31 x 107 m/s experiences a magnetic force of 5.38 x 10-13 N. [0.0460T]
The magnetic field strength is 0.0460T.
8.
A beam of alpha particles is accelerated across a potential difference of 7.50 KV. They are then passed perpendicularly through a magnetic field and turn a circle with a radius of 15.1 cm.
Determine the magnetic field strength. [0.117 T]
The magnetic field strength is 0.117 T.
© Kennedy/Oswald 2008
12
B