Question 1

Which of the solenoids described below has the greatest magnetic field along its axis?

Accepted Answer

A)  a solenoid of length L, with N turns and a current I
B)  a solenoid of length L, with N/2 turns and a current I
C)  a solenoid of length L/2, with N/2 turns and a current I
D)  a solenoid of length 2L, with N turns and a current I/2
E)  a solenoid of length 2L, with 2N turns and a current 2IF) A) and B)
G) C) and D)

Question 2

FIGURE 28-8 2 flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder. A) 0 B) 1.5 × 10-4 T C) 2.5 × 10-4 T D) 4.5 × 10-4 T E) 0.5 × 10-4 T" class="answers-bank-image d-inline" rel="preload" >
-Fig. 28-8 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/ cm2 flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder.

Accepted Answer

A)  0
B)  1.5 × 10-4 T
C)  2.5 × 10-4 T
D)  4.5 × 10-4 T
E)  0.5 × 10-4 TF) C) and D)
G) A) and D)

Question 3

The coulomb is the same as

Accepted Answer

A)  T∙A/m.
B)  A∙s.
C)  A/s.
D)  all of the above
E)  none of the aboveF) C) and D)
G) All of the above

Question 4

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 cm. If the magnitude of the magnetic field generated at the center of the solenoid is 9.000 mT, what is the value of N?

Accepted Answer

A)  860.0
B)  1591
C)  2318
D)  3183
E)  1218F) A) and B)
G) B) and D)

Question 5

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire?

Accepted Answer

A)  0.20 A
B)  0.40 A
C)  0.80 A
D)  3.2 A
E)  1.6 AF) B) and C)
G) A) and B)

Question 6

Describe ferromagnetism.

Accepted Answer

A ferromagnetic material produ...

Question 7

FIGURE 28-5 
-A long straight wire carrying a 4-A current is placed along the x-axis as shown in Fig. 28-5.
(a) What is the magnitude of the magnetic field at a point P, located at y = 0.02 m, due to the current in this wire?
(b) What is the direction of the magnetic field at a point P, located at y = 0.02 m, due to this wire?

Accepted Answer

(a) 40 μT
...

Question 8

The magnetic permeability of a ferromagnetic material is

Accepted Answer

A)  much less than μO.
B)  slightly less than μO.
C)  much greater than μO.
D)  the same as μO.
E)  slightly more than μO.F) A) and B)
G) A) and E)

Question 9

A solenoid with n1 = 1200 turns/m and a current I1 = 2.5 A is filled with a paramagnetic material at a temperature T1 = 320 K. A second solenoid with n2 = 1000 turns/m and a current I2 = 0.85 A is filled with the same paramagnetic material at a different temperature T2. The magnetizations are the same in both cases. What is the value of T2?

Accepted Answer

A)  256 K
B)  150 K
C)  67 K
D)  91 K
E)  201 KF) A) and E)
G) A) and B)

Question 10

The magnetic field near a current carrying wire is directly proportional to the distance from the wire.

Accepted Answer

A) True 
 B)False

Question 11

A toroidal solenoid has a radius R = 0.5 m and a cross-sectional diameter equal to 10 cm. When a current I passes through the coil of the solenoid, the magnetic field at the center of the solenoid has a magnitude B = 2 μT. What is the largest value of the magnetic field in the solenoid for the same value of the current?

Accepted Answer

A)  3.5 μT
B)  1.8 μT
C)  2.2 μT
D)  0.5 μT
E)  2.8 μTF) A) and C)
G) C) and E)

Question 12

The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is

Accepted Answer

A)  1.5 × 10-3 T.
B)  1.5 × 10-5 T.
C)  3.0 × 10-3 T.
D)  3.0 π × 10-4 T.
E)  3.0 × 10-5 T.F) B) and C)
G) A) and E)

Question 13

How much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-T magnetic field at the center?

Accepted Answer

A)  0.013 A
B)  13 A
C)  22 A
D)  40 A
E)  80 AF) C) and E)
G) C) and D)

Question 14

The magnetic field produced by a long straight current-carrying wire is

Accepted Answer

A)  proportional to both the current in the wire and the distance from the wire
B)  proportional to the current in the wire and inversely proportional to the distance from the wire.
C)  inversely proportional to the current in the wire and proportional to the distance from the wire.
D)  inversely proportional to both the current in the wire and the distance from the wire.
E)  independent of both the current in the wire and the distance from the wire.F) D) and E)
G) B) and D)

Question 15

FIGURE 28-6 
-Fig. 28-6 shows two long, parallel current-carrying wires. The wires carry equal currents  =  = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at a point located at an equal distance d from each wire.

Accepted Answer

A)  8μT downward
B)  8μT upward
C)  4μT downward
D)  4μT upward
E)  4μT to the rightF) D) and E)
G) All of the above

Question 16

Describe diamagnetism.

Accepted Answer

Diamagnetism is the effect of the produc...

Question 17

A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then filled with a diamagnetic material. What changes will this make to the magnetic field along the axis of the solenoid?

Accepted Answer

A)  The field will point in the -x direction with a smaller magnitude.
B)  The magnetic field will not change.
C)  The field will point in the same direction with a larger magnitude.
D)  The field will have the same magnitude but will now point in the -x direction.
E)  The field will point in the same direction with a smaller magnitude.F) None of the above
G) A) and C)

Question 18

In ferromagnetic materials the small regions that act like tiny magnets are called

Accepted Answer

A)  conductors.
B)  domains.
C)  iron filings.
D)  spins.
E)  ferromagnets.F) B) and E)
G) A) and E)

Question 19

A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. A current I = 0.1 A is sent through the wire. What is the the magnetic field on the axis of the solenoid?

Accepted Answer

A)  6.6 × 10-5 T
B)  2.5 × 10-5 T
C)  1.3 × 10-5 T
D)  3.6 × 10-5 T
E)  9.8 × 10-5 TF) All of the above
G) A) and B)

Question 20

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnetic force per unit length between the two wires.

Accepted Answer

A)  2.7 × 10-5 N/m repulsive
B)  7.2 × 10-5 N/m repulsive
C)  3.4 × 10-5 N/m attractive
D)  2.7 × 10-5 N/m attractive
E)  7.2 × 10-5 N/m attractiveF) B) and C)
G) B) and E)

Exam 28: Sources of Magnetic Field

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 cm. If the magnitude of the magnetic field generated at the center of the solenoid is 9.000 mT, what is the value of N?

Correct Answer
verified

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnetic force per unit length between the two wires.

Correct Answer
verified

Correct Answer
verified

The magnetic permeability of a ferromagnetic material is

Correct Answer
verified

Describe diamagnetism.

Correct Answer
verified
Diamagnetism is the effect of the produc...
View Answer

Correct Answer
verified

Describe ferromagnetism.

Correct Answer
verified
A ferromagnetic material produ...
View Answer

The magnetic field near a current carrying wire is directly proportional to the distance from the wire.

Correct Answer
verified

In ferromagnetic materials the small regions that act like tiny magnets are called

Correct Answer
verified

Which of the solenoids described below has the greatest magnetic field along its axis?

Correct Answer
verified

Correct Answer
verified
(a) 40 μT
...
View Answer

A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. A current I = 0.1 A is sent through the wire. What is the the magnetic field on the axis of the solenoid?

Correct Answer
verified

The coulomb is the same as

Correct Answer
verified

The magnetic field produced by a long straight current-carrying wire is

Correct Answer
verified

FIGURE 28-8 -Fig. 28-8 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/ cm² flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder.

Correct Answer
verified

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire?

Correct Answer
verified

The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is

Correct Answer
verified

How much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-T magnetic field at the center?

Correct Answer
verified

A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then filled with a diamagnetic material. What changes will this make to the magnetic field along the axis of the solenoid?

Correct Answer
verified

Correct Answer
verified

Exam 28: Sources of Magnetic Field

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 cm. If the magnitude of the magnetic field generated at the center of the solenoid is 9.000 mT, what is the value of N?

Correct AnswerverifiedShow Answer

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnetic force per unit length between the two wires.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The magnetic permeability of a ferromagnetic material is

Correct AnswerverifiedShow Answer

Describe diamagnetism.

Correct AnswerverifiedDiamagnetism is the effect of the produc...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Describe ferromagnetism.

Correct AnswerverifiedA ferromagnetic material produ...View AnswerShow Answer

The magnetic field near a current carrying wire is directly proportional to the distance from the wire.

Correct AnswerverifiedShow Answer

In ferromagnetic materials the small regions that act like tiny magnets are called

Correct AnswerverifiedShow Answer

Which of the solenoids described below has the greatest magnetic field along its axis?

Correct AnswerverifiedShow Answer

Correct Answerverified(a) 40 μT...View AnswerShow Answer

A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. A current I = 0.1 A is sent through the wire. What is the the magnetic field on the axis of the solenoid?

Correct AnswerverifiedShow Answer

The coulomb is the same as

Correct AnswerverifiedShow Answer

The magnetic field produced by a long straight current-carrying wire is

Correct AnswerverifiedShow Answer

FIGURE 28-8 -Fig. 28-8 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/ cm2 flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder.

Correct AnswerverifiedShow Answer

The magnetic field due to the current in a long, straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire. What is the current in the wire?

Correct AnswerverifiedShow Answer

The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is

Correct AnswerverifiedShow Answer

How much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-T magnetic field at the center?

Correct AnswerverifiedShow Answer

A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then filled with a diamagnetic material. What changes will this make to the magnetic field along the axis of the solenoid?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Diamagnetism is the effect of the produc...
View Answer

Correct Answer
verified

Correct Answer
verified
A ferromagnetic material produ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) 40 μT
...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

FIGURE 28-8 -Fig. 28-8 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/ cm² flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified