What is the current in the 10 Ω, resistance in the circuit
shown in the Figure
(2 نقطة)
(a) 0.59 A
(b) 1.0 A
(c) 11 A
(d) 16 A
4
Two wires made of different materials have the same uniform current density. They carry the
same current only if:
(2 نقطة)
A. their lengths are the same
B. both their lengths and cross-sectional areas are the same
c. their cross-sectional areas are the same
D. the potential differences across them are the same
5
When connected to a 120-V source, an electric heater is rated at 1 200 W and a toaster at 6.0 3 102 W. If both appliances are operating in parallel on a 120-V circuit what total current is delivered by an external source?
(2 نقطة)
(a) 12 A
(b) 24 A
(c) 32 A
(d) 15 A
6
Question
(2 نقطة)
a. 1.33 W
b. 2.25 W
c. 3.00 W
d. 7.50 W
7
A student kept her 60-watt, 120-volt study lamp turned on from 2:00 PM until 2:00 AM. How
many coulombs of charge went through it?
(2 نقطة)
A. 150
B. 3, 600
C. 7, 200
D. 21, 600
8
Two resistors of values 6.0 and 12.0 Ω are connected in parallel. This combination in turn is hooked in
series with a 4.0-Ω resistor and a 24-V battery. What is the current in the 6-Ω resistor?
(2 نقطة)
a. 2.0 A
b. 3.0 A
c. 6.0 A
d. 12 A
9
Question
(2 نقطة)
A. µ0i/4R
B. µ0i/R
C. µ0i/4πR
D. µ0i/2R
10
A total resistance of 3.0 Ω is to be produced by combining an unknown resistor R with a 12 Ω
resistor. What is the value of R and how is it to be connected to the 12 Ω resistor?
(2 نقطة)
A. 4.0 Ω, parallel
B. 4.0 Ω, series
C. 2.4 Ω, parallel
D. 2.4 Ω, series
11
Five cylindrical wires are made of the same material. Their lengths and radii are
wire 1: length L, radius r
wire 2: length L/4, radius r/2
wire 3: length L/2, radius r/2
wire 4: length L, radius r/2
wire 5: length 5L, radius 2r
Rank the wires according to their resistances, least to greatest.
(2 نقطة)
A. 1, 2, 3, 4, 5
B. 5, 4, 3, 2, 1
C. 1 and 2 tie, then 5, 3, 4
D. 1, 3, 4, 2, 5
12
If the terminals of a battery are connected across two
identical resistors in series, the total power delivered
by the battery is 8.0 W. If the same battery is connected
across the resistors in parallel, what is the total power
delivered by the battery?
(2 نقطة)
a) 16 W
b) 32 W
c) 2.0 W
d) 4.0 W
13
Conduction electrons move to the right in a certain wire. This indicates that:
(2 نقطة)
A. the current density and electric field both point right
B. the current density and electric field both point left
C. the current density points right and the electric field points left
D. the current density points left and the electric field points right
14
You are facing a loop of wire which carries a clockwise current of 3.0 A and which surrounds
an area of 5.8 × 10−2 m2. The magnetic dipole moment of the loop is:
(2 نقطة)
A. 3.0 A · m2, away from you
B. 3.0 A · m2, toward you
C. 0.17 A · m2, away from you
D. 0.17 A · m2, toward you
15
A rectangular coil (0.20 m x 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. If the
orientation of the coil is varied through all possible positions, the maximum torque on the coil by
magnetic forces is 0.080 N.m. What is the current in the coil?
(2 نقطة)
a. 5.0 mA
b. 1.7 A
c. 8.3 mA
d. 1.0 A
16
Four wires meet at a junction. The first carries 4 A into the junction, the second carries 5 A
out of the junction, and the third carries 2 A out of the junction. The fourth carries:
(2 نقطة)
A. 7 A out of the junction
B. 7 A into the junction
C. 3 A out of the junction
D. 3 A into the junction
17
If the potential difference across a resistor is doubled:
(2 نقطة)
A. only the current is doubled
B. only the current is halved
C. only the resistance is doubled
D. only the resistance is halved
18
A circular loop carrying a current of 1.0 A is oriented in a magnetic field of 0.35 T. The loop has an
area of 0.24 m2 and is mounted on an axis, perpendicular to the magnetic field, which allows the loop
to rotate. What is the torque on the loop when its plane is oriented at a 25° angle to the field?
(2 نقطة)
a. 4.6 N.m
b. 0.076 N.m
c. 0.051 N.m
d. 0.010 N.m
19
Two long straight wires are parallel and carry current in the same direction. The currents are
8.0 and 12 A and the wires are separated by 0.40 cm. The magnetic field in tesla at a point
midway between the wires is:
(2 نقطة)
A. 0
B. 4.0 × 10−4
C. 8.0 × 10−4
D. 12 × 10−4
20
A copper wire of length 25 cm is in a magnetic field of 0.20 T. If it has a mass of 10 g, what is the
minimum current through the wire that would cause a magnetic force equal to its weight?
(g=10m/s2)
(2 نقطة)
a. 1.3 A
b. 1.5 A
c. 2.0 A
d. 4.9 A

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