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figure 1.
The below shows a bar magnet, a coil of wire, and a current meter. If the magnet is withdrawn from the coil, is the induced current through the meter:
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
A. left to right ? 0%
2.
The figure below shows a bar magnet, a coil of wire, and a current meter. If the magnet is held at rest, is the induced current through the meter:
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
A. left to right ?
3.
Lenz's Law states that the direction of any magnetic induction effect is such as to oppose the change in the cause producing it. A large current flows through a long straight wire and nearby is a rectangular wire loop. Which of the situations below correctly shows the direction of the current induced in the rectangular loop by the magnetic field of the long straight wire when its current is in the indicated direction and changing as shown?
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
A.
0% B.
4.
A coil is placed near a solenoid as shown in the diagram. Initially the switch is open. The switch is closed at t = 0 and then, after a few seconds, it is opened again at t = t1. What is the direction of the induced current in the coil at the two times, t = 0 and t = t1?
Stud ent Res e e
pons Valu Corr ect wer Ans Feed back
A.
5.
The figure below show a circuit consisting of a flashlight bulb, rated 9.00 V/3.00 W, and ideal wires and a metal bar with no resistance. The metal bar, shown in grey, is 20.0 cm long and is pulled at constant speed v. A magnetic field of strength 0.200 T is perpendicular to the circuit. With what speed must the metal bar be pulled to light the bulb to full brightness?
Stud ent Res e e
pons Valu Corr ect wer Ans Feed back
A.
6.
A circular loop is in a 0.050 T magnetic field. The edge view of the 11.8 cm diameter circular loop can be seen in the figure below. What is the magnetic flux through the loop? Express your answer in units of mWb, and to two significant figures, where mWb = 10 Wb. Note: Enter only your numerical result in the box.
3
Student e Respons Value Correct Answer
Answer: 0.27 100% 2.7E1 (2.7 10 1 )
General Feedback:
7.
A conductor is formed into a loop that encloses an area of 1.0 m . The loop is oriented at a 30.0 angle with the xyplane. A varying magnetic field is oriented parallel to the zaxis. If the maximum emf induced in the loop is 40.0 V, what is the maximum rate at which the magnetic field strength is changing?
2
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
1. 46 T/s 100 % 2. 80 T/s 3.
8.
A 10 m long conductor is formed into a circle in the xyplane. A uniform magnetic field B = 4.0 i + 19.0 j + 24.0 k T exists in the area of the conductor. Find the magnetic flux through the looped conductor.
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
1. 190 2 Tm 100 % 2. 600 2 Tm 3. 250
9.
A square wire with 1.7 m sides is centred on the origin of the xyplane. A long, straight wire carries a current of 2.0 A, and is located in the xyplane parallel to the yaxis 9.0 m from the origin. If the conductor is moving at 3.0 i + 3.0 j m/s, what emf is present in the conductor? Answer in terms of 0.
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
1. 3.6 0 V 2. 0.02 00 V 3.
10.
The magnetic field between the poles of an electromagnet changes from 6.0 T to 14.0 T as a linear function of time over 4.0 s. Find the magnitude of the electric field induced between the poles of the magnet that results from the change in the magnetic field strength. If R is the radial distance from the axis of the electromagnet, express your answer in terms R, with R in meters, for R smaller than the radius of the electromagnet.
Stud ent Res pon se e
Valu Corr ect wer Fee ck Ans
dba
1. 0.25 R V/ m 2. 4.0R V/m
1.
A closed loop conductor with radius 2.0 m is located in a changing magnetic field. If the maximum emf induced in the loop is 5.0 V, what is the maximum rate at which the magnetic field strength is changing, if the magnetic field is oriented perpendicular to the plane in which the loop lies?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 2.5 T/s 2. 0.40 T/s
3. 5.0
2.
A circular conducting loop with a radius of 0.70 m and a small cap filled with a 10.0 resistor is oriented in the xyplane. If a magnetic field of 3.0 T, making an angle of 30 with the zaxis, increases to 10.0 T in 3.0 s, what is the magnitude of the current that will be caused to flow in the conductor?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.18 A
2. 0.17 A 0% 3. 0.31
3.
A long solenoid has a varying magnetic field B = 4.0t T within it, where t is the time in seconds. If the radius of the solenoid is 5.0 cm, what is the magnitude of the nonCoulomb force on a particle carrying a 2.0 C charge 4.0 cm from the axis of the solenoid?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 25 N 2. 12.8 N 3. 0.01 60 N
4.
A wire loop bent into the shape of a square with 1.5 m sides is centred on the origin of the xyplane. A long, straight wire carries a current of 3.0 A, and is located in the xyplane parallel to the yaxis 9.0 m from the origin. If the resistance of the square wire is 20.0 , and the conductor is moving with velocity 3.0 i m/s, what current is present in the square wire? Answer in terms of 0.
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.00 130 A 2. 0.24 0 A
3.
5.
A 2.0 m conductor is formed into a square and placed in the horizontal A xyplane. magnetic field is oriented 30.0 above the horizontal with a strength of 9.0 T. What is the magnetic flux through the conductor?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 2.3 2 Tm 2. 18 2 Tm
3. 1.9
6.
For a long solenoid, the magnetic field strength within the solenoid is given by the equation B = 5.0t T, where t is the time, in seconds. If the induced electric field outside the solenoid is 11 V/m at a distance 2.0 m from the axis of the solenoid, find the radius of the solenoid.
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 77 m
2. 3.0 m 100 % 3. 9 m
7.
The magnetic field strength of an electromagnet is varied over time as B = 2.0sin(0.12t) T, where t represents time in seconds. The field is approximately uniform over a cylindrical region between the magnet's poles. Write the expression for the electric field strength, as a function of time, that is induced by the variations in the magnetic field strength, a distance R away from the axis of the cylindrical region of magnetic field. (R is assumed to be smaller than the radius of the electromagnet.)
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.24 Rsin (0.1 2t) V/m 2. 0.24 *pi* 2 R si n(0. 12t)
8.
The magnetic field strength of an electromagnet is varied over time. If B = 1.0t T, where t is the time in seconds, what is the magnitude of the nonCoulomb force, as a function of time, exerted on a 4.0 C charge located between the poles of the electromagnet? Express your answer in terms of R, the distance from the axis of the electromagnet to the charge. Assume R is smaller than the radius of the electromagnet.
2
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.13 Rt N
2. 2.0R t N 0% 3.
1.
The magnetic field strength of an electromagnet is varied over time as B = 2.0sin(0.12t) T, where t represents time in seconds. The field is approximately uniform over a cylindrical region between the magnet's poles. Write the expression for the electric field strength, as a function of time, that is induced by the variations in the magnetic field strength, a distance R away from the axis of the cylindrical region of magnetic field. (R is assumed to be smaller than the radius of the electromagnet.)
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.24 *pi* 2 R si n(0. 12t) V/m 2. 0.24 Rsin (0.1 2t)
2.
For a long solenoid, the magnetic field strength within the solenoid is given by the equation B = 5.0t T, where t is the time, in seconds. If the induced electric field outside the solenoid is 11 V/m at a distance 2.0 m from the axis of the solenoid, find the radius of the solenoid.
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 9 m 2. 77 m
3. 3.0 m 100
3.
A closed loop conductor with radius 2.0 m is located in a changing magnetic field. If the maximum emf induced in the loop is 5.0 V, what is the maximum rate at which the magnetic field strength is changing, if the magnetic field is oriented perpendicular to the plane in which the loop lies?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.08 0 T/s
2. 0.40 T/s 100 % 3.
4.
A 2.0 m conductor is formed into a square and placed in the horizontal xyplane. A magnetic field is oriented 30.0 above the horizontal with a strength of 9.0 T. What is the magnetic flux through the conductor?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 18 2 Tm 2. 1.9 2 Tm
3. 1.1
5.
A long solenoid has a varying magnetic field B = 4.0t T within it, where t is the time in seconds. If the radius of the solenoid is 5.0 cm, what is the magnitude of the nonCoulomb force on a particle carrying a 2.0 C charge 4.0 cm from the axis of the solenoid?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.16 0 N 100 % 2. 0.01 60 N 3.
6.
A circular conducting loop with a radius of 0.70 m and a small cap filled with a 10.0 resistor is oriented in the xyplane. If a magnetic field of 3.0 T, making an angle of 30 with the zaxis, increases to 10.0 T in 3.0 s, what is the magnitude of the current that will be caused to flow in the conductor?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.03 1 A 2. 0.18 A
3. 0.31
7.
A wire loop bent into the shape of a square with 1.5 m sides is centred on the origin of the xyplane. A long, straight wire carries a current of 3.0 A, and is located in the xyplane parallel to the yaxis 9.0 m from the origin. If the resistance of the square wire is 20.0 , and the conductor is moving with velocity 3.0 i m/s, what current is present in the square wire? Answer in terms of 0.
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 0.00 130 A 2. 0.24 0 A
3.
8.
The magnetic field strength of an electromagnet is varied over time. If B = 1.0t T, where t is the time in seconds, what is the magnitude of the nonCoulomb force, as a function of time, exerted on a 4.0 C charge located between the poles of the electromagnet? Express your answer in terms of R, the distance from the axis of the electromagnet to the charge. Assume R is smaller than the radius of the electromagnet.
2
S d e tu
nt R e s
p o n s e V u e al
C o e rr ct A n s
w F e e
er
d b a c
7.
A 2.0 m conductor is formed into a square and placed in the horizontal xyplane. A magnetic field is oriented 30.0 above the horizontal with a strength of 9.0 T. What is the magnetic flux through the conductor?
Stud ent Res se e
pon Valu Corr ect wer Ans Fee ck
dba
1. 1.9 2 Tm 2. 18 2 Tm
3. 1.1

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