Figure 27.25
Figure 27.13
Clicker Question
A particle with a positive charge
moves in the xz-plane as shown.
The magnetic field is in the
positive z-direction. The magnetic
force on the particle is in
A. the positive x-direction.
B. the negative x-direction.
C. the positive y-direction.
D. the negative y-direction.
E. none of these
Clicker Question
A particle with a positive charge
moves in the xz-plane as shown.
The magnetic field is in the
positive z-direction. The magnetic
force on the particle is in
A. the positive x-direction.
B. the negative x-direction.
C. the positive y-direction.
D. the negative y-direction.
E. none of these
Clicker Question
A particle with charge q = –1 C is moving in the positive zdirection at 5 m/s. The magnetic field at its position is
What is the magnetic force on the particle?
A.
B.
C.
D.
E. none of these
Clicker Question
A particle with charge q = –1 C is moving in the positive zdirection at 5 m/s. The magnetic field at its position is
What is the magnetic force on the particle?
A.
B.
C.
D.
E. none of these
Clicker Question
A positively charged particle moves in the positive z-direction.
The magnetic force on the particle is in the positive y-direction.
What can you conclude about the x-component of the magnetic
field at the particle’s position?
A. Bx > 0
B. Bx = 0
C. Bx < 0
D. not enough information given to decide
Clicker Question
A positively charged particle moves in the positive z-direction.
The magnetic force on the particle is in the positive y-direction.
What can you conclude about the x-component of the magnetic
field at the particle’s position?
A. Bx > 0
B. Bx = 0
C. Bx < 0
D. not enough information given to decide
Clicker Question
A positively charged particle moves in the positive zdirection. The magnetic force on the particle is in the
positive y-direction. What can you conclude about the ycomponent of the magnetic field at the particle’s position?
A. By > 0
B. By = 0
C. By < 0
D. not enough information given to decide
Clicker Question
A positively charged particle moves in the positive zdirection. The magnetic force on the particle is in the
positive y-direction. What can you conclude about the ycomponent of the magnetic field at the particle’s position?
A. By > 0
B. By = 0
C. By < 0
D. not enough information given to decide
Clicker Question
A positively charged particle moves in the positive z-direction.
The magnetic force on the particle is in the positive y-direction.
What can you conclude about the z-component of the magnetic
field at the particle’s position?
A. Bz > 0
B. Bz = 0
C. Bz < 0
D. not enough information given to decide
Clicker Question
A positively charged particle moves in the positive z-direction.
The magnetic force on the particle is in the positive y-direction.
What can you conclude about the z-component of the magnetic
field at the particle’s position?
A. Bz > 0
B. Bz = 0
C. Bz < 0
D. not enough information given to decide
Clicker Question
Under what circumstances is the total magnetic flux
through a closed surface positive?
A. if the surface encloses the north pole of a magnet,
but not the south pole
B. if the surface encloses the south pole of a magnet, but
not the north pole
C. if the surface encloses both the north and south
poles of a magnet
D. none of the above
Clicker Question
Under what circumstances is the total magnetic flux
through a closed surface positive?
A. if the surface encloses the north pole of a magnet,
but not the south pole
B. if the surface encloses the south pole of a magnet, but
not the north pole
C. if the surface encloses both the north and south
poles of a magnet
D. none of the above
Clicker Question
Recall that
∫
 
E ⋅ dA = qenc /e0
What is the total flux of the magnetic field through any
closed surface?
 
∫ B ⋅ dA = ?
A) zero
B) Ienc times a positive constant
C) -Ienc times a positive constant
Clicker Question
Recall that
∫
 
E ⋅ dA = qenc /e0
What is the total flux of the magnetic field through any
closed surface?
 
∫ B ⋅ dA = ?
A) zero
B) Ienc times a positive constant
C) -Ienc times a positive constant
The Hall Effect
Clicker Question
The electric potential is
A) higher at a
B) higher at b
C) the same in both places
b
a
Clicker Question
IF MAGNETIC FIELDS DO NO WORK ON
CHARGED PARTICLES, WHY DID THE WIRE JUMP?
Clicker Question
Clicker Question
A proton (+) and an electron (-) move side by side
both with velocity v as shown. What is the direction of
the magnetic field at the electron due to the proton (in
our “laboratory” frame of reference)?
A) into page
B) out of page
C) upward
D) downward
E) to the right
v
v
+
-
Clicker Question
A proton (+) and an electron (-) move side by side
both with velocity v as shown. What is the direction of
the magnetic field at the electron due to the proton (in
our “laboratory” frame of reference)?
A) into page
B) out of page
C) upward
D) downward
E) to the right
v
v
+
-
Clicker Question
A proton (+) and an electron (-) move side by side
both with velocity v as shown.The magnetic field is into
the page, by RHR.
What is the direction of the magnetic force on the e- ?
A) into page
B) out of page
C) upward
D) to the left
E) to the right
v
v
+
-
Clicker Question
A proton (+) and an electron (-) move side by side
both with velocity v as shown.The magnetic field is into
the page, by RHR.
What is the direction of the magnetic force on the e- ?
A) into page
B) out of page
C) upward
D) to the left
E) to the right
v
v
+
-
Clicker Question
A proton (+) and an electron (-) move side by side both
with velocity v as shown.
The total force on the electron is still attractive, but
weaker than if no magnetic force were present. What is
the total force on the electron if v=c?
A) 0
B) infinite, away from the proton
C) infinite, toward the proton
v
v
+
-
Clicker Question
A proton (+) and an electron (-) move side by side both
with velocity v as shown.
The total force on the electron is still attractive, but
weaker than if no magnetic force were present. What is
the total force on the electron if v=c?
A) 0
B) infinite, away from the proton
C) infinite, toward the proton
v
v
+
-