Resistors
As more resistors are added in series across a constant voltage source, the power supplied by the source
A) increases
B) decreases
C) remains the same
B) decreases
What would happen if you add more resistors in parallel?
What is the maximum current that can be drawn from a 1.50-V battery with an internal resistance of 0.30 ohm?
5 A
A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points
A) directly away from you.
B) to the left.
C) to the right.
D) directly toward you.
E) vertically upward.
C) to the right.
A long straight conductor has a constant current flowing to the right. A wire rectangle is situated above the wire, and also has a constant current flowing through it (as shown in the figure). Which of the following statements is true?
A) The net magnetic force on the wire rectangle is upward, and there is also a net torque on it.
B) The net magnetic force on the wire rectangle is downward, and there is also a net torque on it.
C) The net magnetic force on the wire rectangle is downward, and the net torque on it is zero.
C) The net magnetic force on the wire rectangle is downward, and the net torque on it is zero.
A 5.0-Ω resistor and a 9.0-Ω resistor are connected in parallel. A 4.0-Ω resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination of the three resistors. What is the current through each resistor?
I5 = 0.53 A
I4 = 0.83 A
I9 = 0.30 A
What value resistor will discharge a 1.0 μF capacitor to 10% of its initial charge in 2.0 ms?
R = 868.6 ohm
A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this current due to the field?
A) downward
B) toward the north
C) toward the south
D) toward the east
E) toward the west
E) toward the west
A square current loop 5.0 cm on each side carries a 500 mA current. The loop is in a 1.2 T uniform magnetic field. The axis of the loop, perpendicular to the plane of the loop, is 30° away from the field direction. What is the magnitude of the torque on the current loop?
7.5*10-4 N*m
A 4.00-Ω resistor, an 8.00-Ω resistor, and a 24.0-Ω resistor are connected together. What is the minimum and maximum Req that can be producing using these 3 resistors?
Maximum = 36 Ω
Minimum = 2.4 Ω
A capacitor is discharged through a 100 Ω resistor. The discharge current decreases to 25% of its initial value in 2.5 ms. What is the value of the capacitor?
18 µ F
What are the magnetic field strength and direction at points a, b and c? Reference the Jeopardy Supplemental Pictures document.
Ba= 66.7 μ T
Bb= 200 μ T
Bc = -66.7 μ T
A circular coil of wire of 200 turns and diameter 2.0 cm carries a current of 4.0 A. It is placed in a magnetic field of 0.70 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnetic torque on the coil?
0.152 N*m
Thirteen resistors are connected across points A and B as shown in the figure. If all the resistors are accurate to 2 significant figures, what is the equivalent resistance between points A and B? If these a 24 V battery is connected to points a and b, what is the current through the 4 Ω resistor?
Reference the Jeopardy Supplemental Pictures document.
Req = 8 Ω
I4 = 0.33 A
A galvanometer coil having a resistance of 20 Ω and a full-scale deflection at 1.0 mA is connected in series with a 4980 Ω resistance to build a voltmeter. What is the maximum voltage that this voltmeter can read?
5 V
A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?
30 degrees
A small bar magnet experiences a 0.020 N*m torque when the axis of the magnet is at 45° to a 0.10 T magnetic field. What is the magnitude of its magnetic dipole moment?
0.283 A*m2
Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 Ω. When they are connected in parallel, their equivalent resistance is 3.3 Ω. What are the resistances of these resistors?
4.9 Ω and 10.1 Ω
For the circuit shown in the figure (reference the Jeopardy Supplemental Pictures document,) determine the current in
(a) the 7.0-Ω resistor.
(b) the 8.0-Ω resistor.
(c) the 4.0-Ω resistor.
(a) I7=1.56 A
(b) I8=1.27 A
(c) I4=0.29 A
The wire shown in the figure carries a current of 2.0 A, flowing from points A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right of the image. What are the magnitude and direction of the forces acting on each segment of the wire? AB, BC, CD, and DE?
AB - 0.106 N out of page
BC - 0 N
CD - 0.09 N out of page
DE - 0.106 N into page
A circular loop of diameter 10 cm, carrying a current of 0.20 A, is placed inside a magnetic field B = 0.30 T k . The normal to the loop is parallel to a unit vector n = -0.60 i - 0.80 j. Calculate the magnitude of the torque on the loop due to the magnetic field.
4.71*10-4 N*m