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Review of Magnetic Forces and Fields
Physics
Study Guide
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1. All magnetic fields are caused by
Compasses
Permanent Magnets
Moving charges
None of the above
2. Two wires running parallel to each other experience
A mutual repulsion
A mutual attraction
No force
Depends on the magnitude of the currents
3. Two wires running perpendicular to each other experience
A mutual repulsion
A mutual attraction
No force
Depends on the magnitude of the currents
4. Two wires running anitparallel to each other experience
A mutual repulsion
A mutual attraction
No force
Depends on the magnitude of the currents
5. Einstein derived relativity from
Electric theory
Magnetic theory
Quantum Mechanics
Thermodynamics
6. The force on a moving charge in the presence of a magnetic field is always
Perpendicular to both the charge's velocity and the magnetic field
Parallel to the charge's velocity
Parallel to the magnetic field
None of the above
7. The force on a moving charge in a magnetic field is always proportional to
The speed of light
The angle between the velocity of the charge and the magnetic field
The velocity of the charge
None of the above
8. The force on a moving charge parallel to a magnetic field is always
Positive
Negative
Zero
Parallel to the magnetic field
9. The force on a charge moving perpendicular to a magnetic field is given by
F
=
F
=
F
=
F
=
10. The force on a wire moving perpendicular to a magnetic field is given by
F
=
F
=
F
=
F
=
11. The force on a charge moving at some angle
θ
to a magnetic field is proportional to
θ
cos
θ
sin
θ
tan
θ
12. The total work done by a magnetic field on a moving charge is always
Positive
Negative
Zero
Depends on the situation
13. The net charge on a wire carrying a current
I
is
0
I

I
I
^{2}
14. The magnetic force is always
Perpendicular to the electric force
Parallel to the electric force
Antiparallel to the electric force
Depends on the situation
15. All magnets have
A north pole
A south pole
An east pole
Both a north and south pole
16. A compass measures
Electric Field
Magnetic Field
Electric Force
Magnetic Force
17. The point on the compass of a needle near a current carrying wire always points
Towards the wire
Away from the wire
Parallel to the wire
Perpendicular to the wire
18. The magnetic field caused by a wire with current
I
is:
B
=
B
=
B
=
B
=
19. Magnetic field lines near straight wires are always
Straight lines
Ellipses
Circles
None of the above
20. The force, per unit length, between two parallel current carrying wires is defined as
F
=
F
=
F
=
F
=
21. The unit of magnetic field, in CGS units, is
Tesla
Gauss
Ampere
Volt
22. The magnitude of the magnetic field at a point
P
caused by a small length of wire,
dl
, at an angle
θ
to the vector from
dl
to
P
is given by
dB
=
Idlr
cos
θ
dB
=
Idlr
sin
θ
dB
=
Idl
sin
θ
dB
=
I
^{2}
dlr
cos
θ
23. What is the magnitude of the magnetic field of a wire carrying a current of
6×10
^{10}
esu/sec, at a distance of 2 cm from the wire?
1
2
3
4
24. A ring of wire carrying a current creates what kind of magnetic field?
Uniform magnetic field
Circular magnetic field
Straight magnetic field
None of the above
25. On the axis of a current carrying ring of radius
b
, at what point is the magnetic field maximum?
z
=
b
z
= 0
z
= 
b
z
=
Πb
26. A ring of radius 2 cm carries a current of
3×10
^{10}
esu/sec. What is the strength of the magnetic field at the center of the ring?
1
2
Π
2
Π
27. The field inside a long solenoid can be approximated as
Circular
Uniform
The field of a single ring
None of the above
28. The magnetic field inside a solenoid is maximum
At one of the ends
At the center
Outside the solenoid
None of the above
29. A solenoid of length 1,000 cm has 2,000 turns carrying a current of
6×10
^{10}
esu/sec. Because it is so long, it can be approximated near the center as an infinite solenoid. What is the magnetic field strength at the center of the solenoid?
16, 000
Π
8, 000
Π
16
Π
8
Π
30. A current carrying wire is placed along the axis of a long solenoid. In what direction does the force on the wire point?
Along the axis of the solenoid
Perpendicular to the axis of the solenoid
Tangential to the wire
There is no force
31. The field along the axis of an infinitely long solenoid is given by
32. The first right hand rule is used to determine
The magnetic field of a wire
The magnetic field of a solenoid
The force on a charge in a magnetic field
None of the above
33. The second right hand rule is used to determine
The magnetic field of a wire
The magnetic field of a solenoid
The force on a charge in a magnetic field
None of the above
34. A ring and an infinite solenoid both have the same radius and current. Which one produces a stronger magnetic field on its axis?
The ring
The solenoid
Both produce the same field
Depends on the situation
35. The divergence of a vector field at a given point is
A vector
A vector field
A scalar
A function
36. What is the divergence of the field
(2
x
, 2
y
, 2
x
)
?
6
4
2
0
37. What is the divergence of the field
(
x
^{2}
,
x
+
y
,
z
)
?
2
3
2
x
2
x
+ 2
38. Gauss' theorem relates
Line integrals and surface integrals
Line integrals and volume integrals
Surface integrals and volume integrals
Two surface integrals
39. Gauss' theorem only applies to
Closed loops
Closed surfaces
Functions with zero divergence
Functions with zero curl
40. The curl of a vector field at a given point is
A vector field
A vector
A scalar
A function
41. The curl measures
The direction of flow of a vector field
The amount and direction of rotation in a vector field
The magnitude of the vector field at a given point
None of the above
42. What is the curl of
(2
x
, 2
y
, 2
z
)
?
(2, 2, 2)
(2, 0, 2)
(1, 1, 1)
(0, 0, 0)
43. Stokes' Theorem relates
Line integrals and surface integrals
Line integrals and volume integrals
Surface integrals and volume integrals
Two surface integrals
44. The line integral around any closed loop in an electric field is equal to
4
ΠQ
0
qE
45. The line integral around any closed loop in a magnetic field is equal to
4
ΠQ
0
qE
46. The curl of any magnetic field is
0
Proportional to the current in the field
Proportional to the current density at a given point
Proportional to the total charge in the field
47. The divergence of any magnetic field is
0
Proportional to the current in the field
Proportional to the current density at a given point
Proportional to the total charge in the field
48. The fact about the divergence in a magnetic field is due to
The curl of the magnetic field
The absence of magnetic charge
The nature of electric currents
The nature of magnetic currents
49.
Jda
is equal to
B
c
I
V
50. How many licks does it take to get to the center of a tootsie roll pop?
The divergence of the tootsie roll pop
Ask the owl
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