# week9-images ```Common Exam II – Monday October 31 4-5:30pm.
Exam will cover Chapters 24, 25, 26, 27, and
28.1-3. Multi-loop Kirchhoff circuits and RC
circuits (last week’s material) and Magnetic
fields (this week’s material) will NOT be on
Common Exam II.
Most of us are familiar with permanent magnets.
Small magnetic material
such as found in compass
can indicate local direction
of magnetic field
Simple Bar magnets have a “north” and
“south” pole analogous to magnetic field of
the earth
Magnetic axis of earth is DIFFERENT than
rotation axis (north geographic axis) of earth.
Why is the north pole of magnet at the south pole?
Force of Magnetic Field (B) on a
charged particle
FB  qv  B
Vector Cross Product follows
Right hand rule.
Clicker Question #1
What is direction of the force on a negatively charged particle for the B field shown in
the figure
A) Out of the page
B) Into the page
C) down
B
D) up
v
E) None of the above
A
B
C
Clicker
Question
#2
What is direction of the magnetic field such that the path of a POSITIVELY charged
particle is as shown in the figure
A) Out of the page
B) Into the page
B?
C) down
D) up
E) None of the above
B
-
v
A
C
+
Clicker Question #3
How would the D position of the particle change if the velocity of the particle
increased? If the mass of the particle increased?
A) increase, increase
B
B) increase, decrease
C) decrease, increase
D) decrease, decrease
E) None of the above
B
v
D
A
C
Clicker Question # 4
The magnetic field is constant and coming out of the page. What would be the
direction of the force of the current carrying wire below?
A) Upward
B) downward
C) Left
D) Out of page
E) None of the above
BB
I
A
C
Clicker Question # 5
The magnetic field is constant and coming out of the page. What would be the
direction of the force of the current carrying wire below?
A) Upward
B) downward
C) Left
D) Out of page
E) None of the above
BB
I
A
C
```