Question 1

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,

Accepted Answer

A)  one wire is lifted slightly as the other wire is forced against the table's surface.
B)  both wires are lifted slightly.
C)  both wires are forced against the table's surface.
D)  the wires attract each other.
E)  the wires repel each other.F) B) and E)
G) C) and D)

Question 2

The magnitude of the magnetic field inside a solenoid is inversely proportional to the current flowing through the solenoid.

Accepted Answer

A) True 
 B)False

Question 3

A small cylinder made of a diamagnetic material is brought near a bar magnet. One end of the cylinder is brought near the North pole of the magnet and is repelled. What happens when the other end of the cylinder is brought near the North pole of the magnet?

Accepted Answer

A)  The other end of the cylinder will not be affected by the magnet.
B)  The other end of the cylinder will be attracted less strongly by the magnet.
C)  The other end of the cylinder will be attracted by the magnet.
D)  The other end of the cylinder will be repelled by the magnet.
E)  The other end of the cylinder will be attracted more strongly by the magnet.F) A) and D)
G) C) and D)

Question 4

A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is

Accepted Answer

A)  μO I/2R.
B)  μO I/4R.
C)  μO I/8R.
D)  μO I/4πR.
E)  μO I/8πR.F) C) and D)
G) A) and B) B

Question 5

Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x-y plane. What magnetic field does one of the wires experience due to the other wires?

Accepted Answer

A)  1.2 × 10-6 T
B)  2.1 × 10-6 T
C)  1.2 × 10-5 T
D)  2.7 × 10-5 T
E)  0 TF) A) and B)
G) All of the above D

Question 6

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wires?

Accepted Answer

A)  1.0 × 10-5 T
B)  2.0 × 10-5 T
C)  3.0 × 10-5 T
D)  4.0 × 10-5 T
E)  5.0 × 10-5 TF) C) and E)
G) B) and E)

Question 7

What is the value of the magnetic field at the center of a square wire of length a on the side, if the current in the wire is I?

Accepted Answer

A)  B = 
B)  B = 
C)  B = 
D)  B = 
E)  B = 0F) D) and E)
G) C) and D)

Question 8

A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force on a 6.4 m length of one of the wires is

Accepted Answer

A)  8.0 × 10-7 N.
B)  5.1 × 10-4 N.
C)  8.0 × 10-5 N.
D)  5.1 × 10-6 N.
E)  not possible to determine with the information given.F) B) and C)
G) B) and D)

Question 9

FIGURE 28-2 
-Fig. 28-2 shows four different sets of wires that cross each other without actually touching. The magnitude of the current is the same in all four cases, and the directions of current flow are as indicated. For which configuration will the magnetic field at the center of the square formed by the wires be equal to zero?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  The field is equal to zero in all four cases.F) A) and B)
G) D) and E) C

Question 10

FIGURE 28-7 
-Two parallel segments of wire, of length L = 0.8m are positioned a distance d = 1 m apart as shown in Fig. 28-7. Calculate the magnetic field at point P located half-way between the two segments. (Each segment carries and electric current I = 10 A in the directions indicated.)

Accepted Answer

A)  8 μT
B)  3 μT
C)  1 μT
D)  0.5μT
E)  0F) D) and E)
G) C) and D)

Question 11

If two identical wires carrying a certain current in the same direction are placed parallel to each other, they will experience a force of repulsion.

Accepted Answer

A) True 
 B)False

Question 12

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,

Accepted Answer

A)  one wire is lifted slightly as the other is forced against the table's surface
B)  both wires are lifted slightly
C)  both wires are forced against the table's surface
D)  the wires attract each other
E)  the wires repel each otherF) A) and C)
G) A) and B)

Question 13

Two parallel wires carry currents in the same direction. The direction of the force on one wire

Accepted Answer

A)  is toward the other wire.
B)  is perpendicular to the plane of the wires.
C)  is away from the other wire.
D)  is along the wire.
E)  cannot be determinedF) C) and D)
G) A) and B)

Question 14

FIGURE 28-1 1 and I2 flowing in opposite directions. Which of the arrows labeled A to D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire? A) A B) B C) C D) D E) The magnetic field is equal to zero at that point." class="answers-bank-image d-inline" rel="preload" >
-Fig. 28-1 above shows two long wires carrying equal currents I1 and I2 flowing in opposite directions. Which of the arrows labeled A to D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  The magnetic field is equal to zero at that point.F) All of the above
G) A) and B)

Question 15

In using Ampere's law, the integral must be evaluated

Accepted Answer

A)  around a path that lies in a plane.
B)  in a clockwise direction.
C)  around a closed path.
D)  around a circular path.
E)  in a counter-clockwise direction.F) C) and D)
G) A) and B)

Question 16

The field near a long straight wire carrying a current is inversely proportional to the current flowing through the wire.

Accepted Answer

A) True 
 B)False

Question 17

Aluminum has a magnetic susceptibility χ = 1.7 × 10-5 at T = 300 K. What will be the magnetization of a small sample of aluminum placed in a 1.5 T magnetic field at T = 150 K?

Accepted Answer

A)  20.3 A/m
B)  1.5 A/m
C)  81.1 A/m
D)  40.6 A/m
E)  10.2 A/mF) A) and B)
G) D) and E)

Question 18

Describe paramagnetism

Accepted Answer

A paramagnetic material has no...

Question 19

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid?

Accepted Answer

A)  16 mT
B)  4.9 mT
C)  15 mT
D)  6.0 mT
E)  9.0 mTF) B) and E)
G) C) and D)

Question 20

A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is

Accepted Answer

A)  3.8 × 10-5 T.
B)  3.8 × 10-7 T.
C)  1.2 × 10-5 T.
D)  1.2 × 10-7 T.
E)  3.8 × 10-8 T.F) All of the above
G) B) and E)

Exam 28: Sources of Magnetic Field

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,

Correct Answer
verified

The magnitude of the magnetic field inside a solenoid is inversely proportional to the current flowing through the solenoid.

Correct Answer
verified

A small cylinder made of a diamagnetic material is brought near a bar magnet. One end of the cylinder is brought near the North pole of the magnet and is repelled. What happens when the other end of the cylinder is brought near the North pole of the magnet?

Correct Answer
verified

A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is

Correct Answer
verified
B

Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x-y plane. What magnetic field does one of the wires experience due to the other wires?

Correct Answer
verified
D

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wires?

Correct Answer
verified

What is the value of the magnetic field at the center of a square wire of length a on the side, if the current in the wire is I?

Correct Answer
verified

A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force on a 6.4 m length of one of the wires is

Correct Answer
verified

Correct Answer
verified
C

FIGURE 28-7 -Two parallel segments of wire, of length L = 0.8m are positioned a distance d = 1 m apart as shown in Fig. 28-7. Calculate the magnetic field at point P located half-way between the two segments. (Each segment carries and electric current I = 10 A in the directions indicated.)

Correct Answer
verified

If two identical wires carrying a certain current in the same direction are placed parallel to each other, they will experience a force of repulsion.

Correct Answer
verified

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,

Correct Answer
verified

Two parallel wires carry currents in the same direction. The direction of the force on one wire

Correct Answer
verified

FIGURE 28-1 -Fig. 28-1 above shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions. Which of the arrows labeled A to D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct Answer
verified

In using Ampere's law, the integral must be evaluated

Correct Answer
verified

The field near a long straight wire carrying a current is inversely proportional to the current flowing through the wire.

Correct Answer
verified

Aluminum has a magnetic susceptibility χ = 1.7 × 10^-5 at T = 300 K. What will be the magnetization of a small sample of aluminum placed in a 1.5 T magnetic field at T = 150 K?

Correct Answer
verified

Describe paramagnetism

Correct Answer
verified
A paramagnetic material has no...
View Answer

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid?

Correct Answer
verified

A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is

Correct Answer
verified

Exam 28: Sources of Magnetic Field

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,

Correct AnswerverifiedShow Answer

The magnitude of the magnetic field inside a solenoid is inversely proportional to the current flowing through the solenoid.

Correct AnswerverifiedShow Answer

A small cylinder made of a diamagnetic material is brought near a bar magnet. One end of the cylinder is brought near the North pole of the magnet and is repelled. What happens when the other end of the cylinder is brought near the North pole of the magnet?

Correct AnswerverifiedShow Answer

A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is

Correct AnswerverifiedB

Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x-y plane. What magnetic field does one of the wires experience due to the other wires?

Correct AnswerverifiedD

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wires?

Correct AnswerverifiedShow Answer

What is the value of the magnetic field at the center of a square wire of length a on the side, if the current in the wire is I?

Correct AnswerverifiedShow Answer

A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force on a 6.4 m length of one of the wires is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedC

FIGURE 28-7 -Two parallel segments of wire, of length L = 0.8m are positioned a distance d = 1 m apart as shown in Fig. 28-7. Calculate the magnetic field at point P located half-way between the two segments. (Each segment carries and electric current I = 10 A in the directions indicated.)

Correct AnswerverifiedShow Answer

If two identical wires carrying a certain current in the same direction are placed parallel to each other, they will experience a force of repulsion.

Correct AnswerverifiedShow Answer

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,

Correct AnswerverifiedShow Answer

Two parallel wires carry currents in the same direction. The direction of the force on one wire

Correct AnswerverifiedShow Answer

FIGURE 28-1 -Fig. 28-1 above shows two long wires carrying equal currents I1 and I2 flowing in opposite directions. Which of the arrows labeled A to D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct AnswerverifiedShow Answer

In using Ampere's law, the integral must be evaluated

Correct AnswerverifiedShow Answer

The field near a long straight wire carrying a current is inversely proportional to the current flowing through the wire.

Correct AnswerverifiedShow Answer

Aluminum has a magnetic susceptibility χ = 1.7 × 10-5 at T = 300 K. What will be the magnetization of a small sample of aluminum placed in a 1.5 T magnetic field at T = 150 K?

Correct AnswerverifiedShow Answer

Describe paramagnetism

Correct AnswerverifiedA paramagnetic material has no...View AnswerShow Answer

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid?

Correct AnswerverifiedShow Answer

A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

FIGURE 28-1 -Fig. 28-1 above shows two long wires carrying equal currents I₁ and I₂ flowing in opposite directions. Which of the arrows labeled A to D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each wire?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Aluminum has a magnetic susceptibility χ = 1.7 × 10^-5 at T = 300 K. What will be the magnetization of a small sample of aluminum placed in a 1.5 T magnetic field at T = 150 K?

Correct Answer
verified

Correct Answer
verified
A paramagnetic material has no...
View Answer

Correct Answer
verified

Correct Answer
verified