1.
A 5.0- C point charge is placed at the center of a cube. The
electric flux in N m 2 /C through one side of the cube is:
__ A.
__ B.
__ C.
__ D.
__ E.
2.
0
7.1
9.4
1.4
5.6
x10 4
x10 4
x10 5
x10 5
The table below gives the electric flux in N
m 2 /C through the ends
and round surfaces of four gaussian surfaces in the form of
cylinders. Rank the cylinders according to the charge inside, from
the most negative to the most positive.
left
cylinder 1: +2
cylinder 2: +3
cylinder 3: -2
cylinder 4: +2
__ A.
__ B.
__ C.
__ D.
__ E.
3.
1,
4,
3,
3,
4,
2,
3,
4,
1,
3,
3,
2,
2,
4,
1,
end
10 -9
10 -9
10 -9
10 -9
right end
+4
10 -9
-2
10 -9
-5
10 -9
-5
10 -9
rounded surface
-6
10 -9
+6
10 -9
+3
10 -9
-3
10 -9
4
1
1
2
2
A round wastepaper basket with a 0.15-m radius opening is in a
uniform electric field of 300 N/C, perpendicular to the opening.
The total flux through the sides and bottom, in N
m 2 /C, is:
__ A.
__ B.
__ C.
__ D.
__ E.
0
4.2
21
280
can't tell without knowing the areas of the sides and bottom
1
4.
Positive charge Q is placed on a conducting spherical shell with
inner radius R 1 and outer radius R 2 . A point charge q is placed at
the center of the cavity. The magnitude of the electric field at a
point outside the shell, a distance r from the center, is:
0R 1
__ B.
0 (R 1
2
0r
__ C.
5.
2
__ E.
0 (R 1
2
- r 2)
Charge is distributed uniformly on the surface of a large flat
plate. The electric field 2 cm from the plate is 30 N/C. The
electric field 4 cm from the plate is:
__ C.
__ D.
__ E.
120 N/C
80 N/C
30 N/C
15 N/C
7.5 N/C
An electron traveling north enters a region where the electric
field is uniform and points north. The electron:
__ A.
__ B.
__ C.
__ D.
__ E.
speeds up
slows down
veers east
veers west
continues with the same speed in the same direction
Current is a measure of:
__ A.
__ B.
__ C.
__ D.
__ E.
8.
- r 2)
0r
__ B.
7.
2
__ D.
__ A.
6.
2
__ A.
force that moves a charge past a point
resistance to the movement of a charge past a point
energy used to move a charge past a point
amount of charge that moves past a point per unit time
speed with which a charge moves past a point
A flat iron is marked "120 volt, 600 watt". In normal use, the
current in it is:
__ A.
__ B.
__ C.
__ D.
__ E.
2A
4A
5A
7.2 A
0.2 A
2
9.
An ordinary light bulb is marked "60 watt, 120 volt". Its (heated)
resistance is:
__ A.
__ B.
__ C.
__ D.
__ E.
10.
is connected to a 20-V emf device. The current in the device is:
__ A.
__ B.
__ C.
__ D.
__ E.
0.25 A
1.0 A
4.0 A
5.0 A
100 A
11.
is connected to a 20-V emf device. The current in any one of the
resistors is:
__ A.
__ B.
__ C.
__ D.
__ E.
0.25 A
1.0 A
4.0 A
5.0 A
100 A
12.
is connected to a 20-V emf device. The current in any one of the
resistors is:
__ A.
__ B.
__ C.
__ D.
__ E.
0.25 A
1.0 A
4.0 A
5.0 A
100 A
3
13.
is connected to a 20-V emf device. The potential difference across
any one of the resistors is:
__ A.
__ B.
__ C.
__ D.
__ E.
4V
5V
8V
20 V
80 V
14.
__ A.
__ B.
__ C.
__ D.
__ E.
12 A
4.0 A
2.4 A
2.0 A
0.50 A
15.
__ A.
__ B.
__ C.
__ D.
__ E.
16.
4V
8V
12 V
24 V
48 V
In an antique automobile, a 6-V battery supplies 24 W to each of
the two identical headlights in parallel. The resistance (in ohms)
of each bulb is:
__ A.
0.67
__ B.
1.5
__ C.
3
__ D.
4
__ E.
8
4