71) When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
71) ______
A) be reduced by a factor of one-fourth.
B) triple.
C) quadruple.
D) double.
E) be.
11) A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves downward. We may conclude that the magnetic field must have a component
11) ______
A) towards the south.
B) towards the west.
C) downward.
D) upward.
E) towards the north.
12) An electron.
71) A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width.
61) Three capacitors of capacitance 5.00 μF, 10.0 μF, and 50.0 μF are connected in series across a 12.0-V potential difference (a battery).
(a) How much charge is stored in the 5.00-μF capacitor?
(b) What is the potential difference across the 10.0-µF capacitor?
61)
_____________
62) A 1.0-µF capacitor and a 2.0-µF.
81) What is the equivalent resistance in the circuit shown in the figure?
81) ______
A) 50 Ω
B) 35 Ω
C) 80 Ω
D) 55 Ω
82) Each of the resistors shown in the figure has a resistance of What is the equivalent resistance between points a and.
21) The three loops of wire shown in the figure are all hanging in the same uniform magnetic field that is perpendicular to the page and does not vary with time. Loop 1 swings back and forth like the bob in a pendulum, Loop 2 rotates about a vertical.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
141) The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?
141) _____
A) 32 V
B).
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
121) In the figure, the rectangular loop is pivoted about one side (of length 0.060 m), that coincides with the y-axis. The end (length 0.020 m) of the loop that lies in the xz-plane.
91) When an external resistor of resistance R1 = 14 Ω is connected across the terminals of a battery, a current of 6.0 A flows through the resistor. When a different external resistor of resistance R2 = 64.4 Ω is connected instead, the current is 2.0 A. Calculate (a) the.
141) The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 μT. How far is point P from the wire? (μ0 = 4π × 10-7 T ? m/A) 141) _____
A) 2.0 cm
B) 10 cm
C) 4.0 cm
D).
111) A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as.
101) For the circuit shown in the figure, the battery is ideal and all quantities are accurate to two significant figures. Find the current through (a) the 1.0-Ω resistor, (b) the 3.0-Ω resistor, and (c) the 4.0-Ω resistor.
101)
____________
102) Two 100-W light bulbs of fixed resistance are to.
71) The network shown is assembled with uncharged capacitors X , Y, and Z, with CX = 4.0 μF, CY = 6.0 μF, and CZ = 5.0 μF. The switches S1 and S2 are initially open, and a potential difference Vab = 120 V is applied between points a and.
21) A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves
21) ______
A) straight downward.
B) in a plane parallel.
111) An ac generator contains 80 flat rectangular loops of wire, each of which is 12 cm long and 8 cm wide. The loops rotate at 1200 rpm about an axis through the center and parallel to the long side. If the magnetic field in which the loop rotates is.
141) In the circuit shown in the figure, R1 = 60 Ω, R2 = 120 Ω, R3 = 180 Ω, V1 = 3.0 V, V2 = 6.0 V, and the batteries are both ideal. What is the current through R1?
141) _____
A) 0.050 A
B) 0.00 A
C) 2.68.
101) A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.
101) _____
A) 6.0 N
B) 0.75 N
C) 3.0.
101) A conducting rod of length ?= 25 cm is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0 Ω, as shown in the figure. The wire and the rod are in the plane of the page. A constant uniform magnetic field.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A flat coil is in a uniform magnetic field. The magnetic flux through the coil is greatest when the plane of its area is
1) _______
A) perpendicular to the magnetic field.
B) at.
61) A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of
61) ______
A) 8d.
B) 2d..
31) As shown in the figure, a C-shaped conductor is in a uniform magnetic field B out of the page, and this field is increasing. What is the polarity of the induced emf in terminals X and Y?
31) ______
A) X and Y are at the same potential.
B).
151) A multiloop circuit is shown in the figure. Find the current I1 if the batteries are ideal. (It is not necessary to solve the entire circuit.)
151) _____
A) 6 A
B) 0 A
C) 2 A
D) -5 A
E) -2 A
152) A multiloop circuit is shown.
131) A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?
131).
171) A resistor with a resistance of 360 Ω is in a series circuit with a capacitor of capacitance 7.3 × 10-6 F. What capacitance must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value?
171) .
51) A 5.0-μF capacitor and a 7.0-μF capacitor are connected in series across an 8.0-V potential source. What is the potential difference across the 5.0-μF capacitor?
51) ______
A) 0 V
B) 2.7 V
C) 8.0 V
D) 4.7 V
E) 3.6 V
52) A 2.0-μF capacitor and a 4.0-μF.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
31) A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is.
131) Three resistors with resistances of 2.0 Ω, 6.0 Ω, and 12 Ω are connected across an ideal dc voltage source V as shown in the figure. If the total current through the circuit is I = 2.0 A, what is the applied voltage V?
131) _____
A) 1.5 V.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
161) American power plants usually supply 120 V ac.
(a) At what frequency is this voltage supplied?
(b) What is the maximum voltage?
161)
____________
162) A 100-W light bulb is powered by 120 V ac.
11) An outer metal ring surrounds an inner metal ring, as shown in the figure. The current in the outer ring is counterclockwise and decreasing. What is the direction of the induced current in the inner ring?
11) ______
A) counterclockwise
B) clockwise
C) There is no induced current in.
21) A 9-V battery is hooked up to two resistors in series using wires of negligible resistance. One has a resistance of 5 Ω, and the other has a resistance of 10 Ω. Several locations along the circuit are marked with letters, as shown in the figure. Which statements about.
51) The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is
51) ______
A) 0°
B) 135°
C) 90°
D) 45°
52) A flat circular wire loop lies in a horizontal plane on a table.
81) A closed flat loop conductor with radius is located in a changing uniform magnetic field. If the emf induced in the loop is what is the rate at which the magnetic field strength is changing if the magnetic field is oriented perpendicular to the plane in which.
91) An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg) 91) ______
A) 1.9 × 107 m/s
B) 3.0 ×.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) If you were to cut a small permanent bar magnet in half,
1) _______
A) one piece would be a magnetic north pole and the other piece would be a south pole.
B) each.
41) A charged capacitor is connected in series with a resistor and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the potential difference V across the capacitor as a function of time t?
41)
_____________
42) An uncharged.
51) A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach
51) ______
A) 100% of the maximum current.
B) 75% of the maximum current.
C) 63% of the maximum current.
D) 25%.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
11) Draw a circuit with two batteries, a resistor between them, and a capacitor in parallel with the resistor. The batteries are connected negative pole to positive pole.
11)
_____________
12) Draw a circuit.
41) A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?
41) ______
A) toward the east
B) toward the south
C) downward
D) toward the west
E) upward.
31) A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?
31) ______
A) T
B) 9T
C) T/3
D).
131) The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
131) _____
A) 100 V.
B) 50 V.
C) 200 V.
D) none.
41) A transformer is a device that normally
41) ______
A) operates only on dc.
B) operates on either dc or ac.
C) operates only on ac.
42) If the secondary coil of a transformer contains more loops than the primary coil, then it is a
42) ______
A) step-up.
61) What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?
61) ______
A) 45°
B) 270°
C) 90°
D) 0°
E) 180°
62) Which of the following statements is true for a series RLC ac circuit in resonance? (There could be.
121) What is the magnitude of the potential difference between points C and D for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
121) _____
A) 6.0 V
B) 4.0 V
C) 3.0 V
D) 2.0 V
122).
111) A 3.0-Ω resistor is connected in parallel with a 6.0-Ω resistor. This combination is then connected in series with a 4.0-Ω resistor. The resistors are connected across an ideal 12-volt battery. How much power is dissipated in the 3.0-Ω resistor?
111) _____
A) 5.3 W
B) 6.0 W
C).
91) A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × . If the area of this loop changes steadily from its original value to a new value of 1.6 × 10-3 m2 in.
151) The series circuit shown in the figure contains an ideal battery with a constant terminal voltage an ideal inductor a resistor resistor, and a switch S.Initially, the switch is open, and there is no current in the inductor. At time the switch is suddenly closed. What.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
81) A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts.
121) The primary coil of an ideal transformer has 600 turns and its secondary coil has 150 turns. If the current in the primary coil is 2 A, what is the current in its secondary coil?
121) _____
A) 1/4 A
B) 2 A
C) 8 A
D) 1/2 A.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
161) A 2.0-μF capacitor is charged to 12 V and then discharged through a 4.0-MΩ resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
161) _____
A).
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
151) An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (μ0 =.
