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Question 1
Uniformly charged ring of charge Q and
radius R
1) Q / Δθ
2) QR)
3) Q*ΔθR)
What is Q, expressed in terms of given 4) Q*Δθ
constants and an integration variable?
5) Q*R*ΔθR)
Question 2
Uniformly charged ring of
charge Q and radius R
What are the integration limits?
1) 0 to ∞
2)
3)
4)
5)
∞ to +∞
0 to θ
0 to 
– to +
Question 3
By thinking about the physical situation,
predict the magnitude of the electric field
at the center of a uniformly charged ring
of radius R carrying a charge +Q. Then
use the formula we just derived to
confirm this result.
1) E = 1/(4ε0) Q/z2
2) E = 1/(4ε0) Qz/R3
3) E = 0
4) E = ∞
Question 4
The electric field inside a large capacitor is shown at left.
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Which arrow best represents the
electric field at the "x"?
Question 5
The electric field at any location inside a hollow, uniformly charged
sphere, due to the charge on the surface of the sphere, is zero.
True or false?
1) True, because the electric field can't penetrate the material of
the sphere
2) True, because the contributions of all the charges on the
surface add up to zero at every location inside the sphere.
3) True, but only at the center of the sphere, where all the
contributions cancel.
4) False, because the electric field due to the surface charges
penetrates the sphere.
Question 6
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A spherical shell is
uniformly charged
as shown.
What is the
direction of the
electric field at x?
Question 7
A spherical shell is
uniformly charged
as shown.
What is the
direction of the
electric field at x?
Question 8
A spherical shell is
uniformly charged
as shown.
What is the
direction of the
electric field at x?
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Question 9
A spherical shell is
charged as shown.
What is the
direction of the
electric field at x?
Question 10 Think carefully
A negatively charged hollow plastic
sphere is near a negatively charged
plastic rod. What is the direction of the
net electric field at location P, inside
the sphere?
Question 11
A solid plastic ball has negative charge uniformly spread over its
surface. Remember that the electric field inside a uniformly charge
sphere, due to the charges on the sphere, is zero. Which diagram
best shows the polarization of molecules inside the ball?
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Question 12
You stand at location A, a distance d from the origin, and hold a
small charged ball. You find that the electric force on the ball is
0.008 N. You move to location B, a distance 2d from the origin, and
find the electric force on the ball to be 0.004 N.
What object located at the origin might be the source of the field?
1) A point charge
5) A uniformly charged disk
2) A dipole
6) A capacitor
3) A uniformly charged rod 7) A uniformly charged hollow sphere
4) A uniformly charged ring 8) None of the above
Question 13
You stand at location A, a distance d from the origin, and hold a
small charged ball. You find that the electric force on the ball is
0.08 N. You move to location B, a distance 2d from the origin, and
find the electric force on the ball to be 0.01 N.
What object located at the origin might be the source of the field?
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1) A point charge
2) A dipole
3) A uniformly charged rod
4) A uniformly charged ring
5) A uniformly charged disk
6) A capacitor
7) A uniformly charged hollow sphere
8) None of the above
Question 14
You stand at location A, a distance d from the origin, and hold a
small charged ball. You find that the electric force on the ball is
0.009 N. You move to location B, a distance 2d from the origin, and
find the electric force on the ball to be 0.0045 N.
What object located at the origin might be the source of the field?
1) A point charge
5) A uniformly charged disk
2) A dipole
6) A capacitor
3) A uniformly charged rod 7) A uniformly charged hollow sphere
4) A uniformly charged ring 8) None of the above
Question 15
You stand at location A, a distance d from the origin, and hold a
small charged ball. You find that the electric force on the ball is
0.009 N. You move to location B, a distance 2d from the origin, and
find the electric force on the ball to be 0.00899 N.
What object located at the origin might be the source of the field?
1) A point charge
5) A uniformly charged disk
2) A dipole
6) A capacitor
3) A uniformly charged rod 7) A uniformly charged hollow sphere
4) A uniformly charged ring 8) None of the above
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