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Transcript
```Question 1
What is the direction of
the electric field at the
location of the point
charge, due to the
dipole?
Question 2
What is the direction of
the electric force on the
point charge, due to the
dipole?
Question 3
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1
A positive point charge causes a neutral
molecule to polarize, as shown below.
What is the direction of the electric force
on the point charge, due to the induced
dipole?
Question 4
A negatively charged ion is
located to the left of a neutral
molecule. Which diagram
correctly shows the polarization
of the neutral molecule?
Question 5
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A negative point charge causes a
neutral molecule to polarize, as shown
below. What is the direction of the
electric force on the point charge, due
to the induced dipole?
Question 6
A point charge is brought near a
neutral molecule. (There is
nothing else nearby).
1. Yes. The molecule can
polarize so that it repels the
point charge.
Is it possible for the point charge
and the neutral molecule to repel
each other?
2. No. The molecule can
only polarize in a way that
will attract the point charge.
Question 7
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3
You observe that a tape is
attracted to a negatively
charged plastic pen.
What can you conclude?
Question 8
A positively charged tape is
1. The tape is positively charged.
2. The tape is negatively charged.
3. The tape is neutral.
4. The tape could be positive or
neutral.
5. The tape could be positive,
negative, or neutral.
Which diagram best shows the
polarization of a molecule in
Question 9
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What is the direction of the
force on the tape, due to the
polarized molecules in your
hand?
Question 10
Which diagram best shows the polarization of your blood by a
negative tape?
1)
3)
493718081
2)
4)
5
Question 11
A glass of Gatorade is placed near a charged tape. Which diagram
best shows the polarization of the Gatorade (which contains K+,
Na+, Cl–, and other ions)?
1
2
4
3
Question 12
What is the direction of the net electric
field at location A, inside the Gatorade?
Question 13
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6
In a region of space there is an electric field upward (in the +y
direction), due to charges not shown in the diagram. A neutral
copper block is placed in the region. Which diagram best
describes the charge distribution on the block?
Question 14
A negatively charged iron block is placed in a region where there
is an electric field downward (in the –y direction) due to charges
not shown. Which diagram best describes the charge distribution
in and/or on the iron block?
Question 15
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7
A neutral copper block is polarized as shown, due to an electric
field made by external charges (not shown). What is the direction
of the net electric field at location B, which is inside the copper
block?
Question 16
A neutral copper block is located near two balls which have equal
negative charges, as shown in the diagram. What is the direction
of the net electric field at location A?
Think carefully
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8
Question 17
A solid plastic ball has negative charge uniformly spread over its
surface. Remember that the electric field inside a uniformly
charged sphere, due to the charges on the sphere, is zero. Which
diagram best shows the polarization of molecules inside the ball?
Question 18
A & B are identical metal blocks.
What is the final charge of block
B?
1. +6 nC
2. +3 nC
3. 0 nC
4. - 3 nC
5. -6 nC
Question 19
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A & B are identical metal blocks.
What happens?
1. protons move from A to B
2. positrons move from A to B
3. electrons move from B to A
4. both protons and electrons
move
5. no charges move
Question 20
You neutralize a positively
charged tape by running your
finger across it.
What happens?
1. mobile electrons move from
skin to tape
2. Cl- ions move from skin to tape
3. protons move from tape to skin
4. + ions move from tape to skin
5. no charges move
Question 21
Two aluminum blocks, A and B, are initially neutral. They have
insulating handles, which are not shown.
This sequence occurs:
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10
At a time after t4,
what is the net
charge of A?
1) positive
2) negative
3) neutral
Question 22
An electric field point
to the right is present
at the location of an
insulating block.
Which drawing shows the correct
resultant polarization?
E
Question 23
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An electric field point to Which drawing shows the correct
the right is present at the resultant polarization?
location of an metal
block.
E
Question 24
You have a positive point
charge q and a solid metal
sphere shown.
What is the direction of
Enet at the center of the
sphere?
Question 25
You have a positive point
charge q and a solid metal
sphere shown.
What is the direction of
Enet at location A?
Question 26
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12
What is the direction
of the electric field at
x due to the dipole?
Question 27
What is the direction
of the electric field at
x due to the plastic
block?
Question 28
What is the direction
of the net electric field
at x?
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```
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