Question 1

FIGURE 22-8  
-A long wire carrying a 2.0-A current is placed along the y-axis. What is the magnitude of the magnetic field at a point 0.60 m along the x-axis?

Accepted Answer

A)  6.7 × 10-7 T 
B)  13 × 10-7 T 
C)  1.2 × 10-7 T 
D)  6.7 T 
E)  12 T 
A)  6.7 × 10-7 T 
B)  13 × 10-7 T 
C)  1.2 × 10-7 T 
D)  6.7 T 
E)  12 T

Question 2

How many turns should a 10-cm long solenoid have if it is to generate a 1.5 × 10-3 T magnetic field on 1.0 A of current?

Accepted Answer

A)  12 
B)  15 
C)  119 
D)  1194 
E)  3183 
A)  12 
B)  15 
C)  119 
D)  1194 
E)  3183

Question 3

When you double the number of windings in a solenoid keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will

Accepted Answer

A)  double. 
B)  triple. 
C)  quadruple. 
D)  be reduced to one-fourth as much. 
E)  be reduced to half as much. 
A)  double. 
B)  triple. 
C)  quadruple. 
D)  be reduced to one-fourth as much. 
E)  be reduced to half as much.

Question 4

A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?

Accepted Answer

A)  The electric and magnetic fields must be perpendicular to each other in that region. 
B)  The electric and magnetic fields must be parallel to each other in that region. 
C)  Both electric and magnetic fields must be zero in that region. 
D)  The electric field must be zero but not the magnetic field in that region. 
E)  The magnetic field must be zero but not the electric field in that region. 
A)  The electric and magnetic fields must be perpendicular to each other in that region. 
B)  The electric and magnetic fields must be parallel to each other in that region. 
C)  Both electric and magnetic fields must be zero in that region. 
D)  The electric field must be zero but not the magnetic field in that region. 
E)  The magnetic field must be zero but not the electric field in that region.

Question 5

A proton is projected with a velocity of 7.0 × 103 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?

Accepted Answer

A)  0 N 
B)  3.4 × 10-16 N 
C)  4.2 × 10-16 N 
D)  13 × 10-16 N 
E)  6.7 × 10-16 N 
A)  0 N 
B)  3.4 × 10-16 N 
C)  4.2 × 10-16 N 
D)  13 × 10-16 N 
E)  6.7 × 10-16 N

Question 6

Two long, parallel wires carry currents of 4.00 A and 6.00 A. If the distance between the wires is 0.400 m, what is the force per unit length between the wires?

Accepted Answer

A)  2.00 μN/m 
B)  5.00 μN/m 
C)  12.0 μN/m 
D)  16.0 μN/m 
E)  38.0 μN/m 
A)  2.00 μN/m 
B)  5.00 μN/m 
C)  12.0 μN/m 
D)  16.0 μN/m 
E)  38.0 μN/m

Question 7

FIGURE 22-7  
-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. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of Figure 22-7. The figure indicates the dimensions of the wire. What is the magnitude and direction of the force acting on section AB of this wire?

Accepted Answer

A)  0.20 N perpendicular out of the page 
B)  0.40 N perpendicular out of the page 
C)  0.11 N perpendicular out of the page 
D)  0.20 N perpendicular into the page 
E)  0.11 N perpendicular into the page 
A)  0.20 N perpendicular out of the page 
B)  0.40 N perpendicular out of the page 
C)  0.11 N perpendicular out of the page 
D)  0.20 N perpendicular into the page 
E)  0.11 N perpendicular into the page

Question 8

The magnetic field at a certain distance from a wire carrying 2-A current is 4 μT. What will be the magnetic field if the current in the wire is doubled?

Accepted Answer

A)  2 μT 
B)  4 μT 
C)  6 μT 
D)  8 μT 
E)  10 μT 
A)  2 μT 
B)  4 μT 
C)  6 μT 
D)  8 μT 
E)  10 μT

Question 9

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

Accepted Answer

A)  4.8 × 10-14 N 
B)  1.9 × 10-15 N 
C)  5 × 10-20 N 
D)  2.2 × 10-24 N 
E)  zero 
A)  4.8 × 10-14 N 
B)  1.9 × 10-15 N 
C)  5 × 10-20 N 
D)  2.2 × 10-24 N 
E)  zero

Question 10

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 A 
A)  0.20 A 
B)  0.40 A 
C)  0.80 A 
D)  3.2 A 
E)  1.6 A

Question 11

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?

Accepted Answer

A)  along the +z-axis 
B)  along the -z-axis 
C)  along the -x-axis 
D)  along the +y-axis 
E)  along the -y-axis 
A)  along the +z-axis 
B)  along the -z-axis 
C)  along the -x-axis 
D)  along the +y-axis 
E)  along the -y-axis

Question 12

FIGURE 22-6  
-A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?

Accepted Answer

A)  counterclockwise 
B)  clockwise 
C)  It is indifferent if clockwise or counterclockwise. 
D)  The current in the loop should be zero A. 
A)  counterclockwise 
B)  clockwise 
C)  It is indifferent if clockwise or counterclockwise. 
D)  The current in the loop should be zero A.

Question 13

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 14

A wire carrying a current that placed in a magnetic field will experience a maximum force if the angle between the direction of the current and the direction of the magnetic field is 60°.

Accepted Answer

A) True 
 B)False

Question 15

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 repulsive 
B)  7.2 × 10-5 N repulsive 
C)  3.4 × 10-5 N attractive 
D)  2.7 × 10-5 N attractive 
E)  7.2 × 10-5 N attractive 
A)  2.7 × 10-5 N repulsive 
B)  7.2 × 10-5 N repulsive 
C)  3.4 × 10-5 N attractive 
D)  2.7 × 10-5 N attractive 
E)  7.2 × 10-5 N attractive

Question 16

A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude force acting on the proton?

Accepted Answer

A)  8.0 × 10-15 N 
B)  3.9 × 10-15 N 
C)  2.6 × 10-15 N 
D)  0 N 
E)  1.3 × 10-15 N 
A)  8.0 × 10-15 N 
B)  3.9 × 10-15 N 
C)  2.6 × 10-15 N 
D)  0 N 
E)  1.3 × 10-15 N

Question 17

Describe ferromagnetism.

Accepted Answer

A ferromagnetic material produ

Question 18

FIGURE 22-9  
-A long straight wire carrying a 4-A current is placed along the x-axis as shown in Figure 22-9. 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)  into the plane of the page 
B)  out of the plane of the page 
C)  along the -x-axis 
D)  along the +x-axis 
E)  along the +y-axis 
A)  into the plane of the page 
B)  out of the plane of the page 
C)  along the -x-axis 
D)  along the +x-axis 
E)  along the +y-axis

Question 19

The magnetic field due to a 2-A current flowing in a long, straight wire is 8 μT at a point P, a certain distance away from the wire. How far is this point from the center of the wire?

Accepted Answer

A)  2 cm 
B)  3 cm 
C)  4 cm 
D)  5 cm 
E)  6 cm 
A)  2 cm 
B)  3 cm 
C)  4 cm 
D)  5 cm 
E)  6 cm

Question 20

FIGURE 22-3  
-A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?

Accepted Answer

A)  ILB/2 
B)  0 N 
C)  ILB sinθ 
D)  ILB cos θ 
E)  ILB 
A)  ILB/2 
B)  0 N 
C)  ILB sinθ 
D)  ILB cos θ 
E)  ILB

Exam 22: Magnetism

FIGURE 22-8 -A long wire carrying a 2.0-A current is placed along the y-axis. What is the magnitude of the magnetic field at a point 0.60 m along the x-axis?

How many turns should a 10-cm long solenoid have if it is to generate a 1.5 × 10-3 T magnetic field on 1.0 A of current?

When you double the number of windings in a solenoid keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will

A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?

A proton is projected with a velocity of 7.0 × 103 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?

Two long, parallel wires carry currents of 4.00 A and 6.00 A. If the distance between the wires is 0.400 m, what is the force per unit length between the wires?

The magnetic field at a certain distance from a wire carrying 2-A current is 4 μT. What will be the magnetic field if the current in the wire is doubled?

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

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?

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?

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.

A wire carrying a current that placed in a magnetic field will experience a maximum force if the angle between the direction of the current and the direction of the magnetic field is 60°.

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.

A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude force acting on the proton?

Describe ferromagnetism.

FIGURE 22-9 -A long straight wire carrying a 4-A current is placed along the x-axis as shown in Figure 22-9. What is the direction of the magnetic field at a point P, located at y = 0.02 m, due to this wire?

The magnetic field due to a 2-A current flowing in a long, straight wire is 8 μT at a point P, a certain distance away from the wire. How far is this point from the center of the wire?

FIGURE 22-3 -A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric Potential Energy

Electric Current and Direct-Current Circuits

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

How many turns should a 10-cm long solenoid have if it is to generate a 1.5 × 10^-3 T magnetic field on 1.0 A of current?

A proton is projected with a velocity of 7.0 × 10³ m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?

An electron moves with a speed of 3.0 × 10⁴ m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?

A proton moving with a velocity of 4.0 × 10⁴ m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude force acting on the proton?