Physics 12 spring 2007 Test 2
Name:
Please
circle
the best answer to the following questions.
1)
Equipotential lines
A) Start on positive charges
B) Start on negative charges
C) Do not form closed loops
D) Are not vectors
2)
Four point charges of equal magnitude are placed at the corners a square as
shown. Which one is correct regarding the electric potential at locations A, B and
C?
A) V
A
> V
C
> V
B
B)
V
A
> V
B
> V
C
C) V
B
> V
A
> V
C
D) None of above
3)
If the potential at a distance very far from a dipole is Vo, then the potential at
twice of that distance from the dipole is:
A)
Vo
B)
Vo/2
C)
Vo/4
D)
Vo/8
1
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View Full Document4)
Given the electric potential
y
x
a
y
x
V
2
)
,
(
=
with
)
/
(
2
3
m
volt
a
=
4.1 ) which one is correct regarding the electric potential at A and B?
A)
V
A
= 4 (volt)
V
B
= 4 (volt)
B)
V
A
= 8 (volt)
V
B
= 4 (volt)
C)
V
A
= 4 (volt)
V
B
= 8 (volt)
D)
V
A
= 8 (volt)
V
B
= 8 (volt)
4.2 ) which one is correct regarding the x, y components of electric field at B?
A)
E
x
= 8 (V/m)
E
y
= 8 (V/m)
B)
E
x
= 8 (V/m)
E
y
= 8 (V/m)
C)
E
x
= 8 (V/m)
E
y
= 8 (V/m)
D)
E
x
= 8 (V/m)
E
y
= 4 (V/m)
5)
If an electron is accelerated through a potential difference of 500 V between two
parallel plates separated by a distance of 2.0 cm. The change in kinetic energy of
the electron during this motion is
A)
250 eV
B)
500 eV
C)
1000 eV
D)
2000 eV
6)
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 Fall '07
 Wang
 Physics, Charge, Electric Potential, Electric charge, inner radius r1, conductor cavity

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