A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 107 m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10-19 C. What is the force on the electron at this instant?

A) 1.3 × 10-16 N in the +x direction B) 1.3 × 10-16 N in the -x direction C) 6.5 × 10-10 N in the +y direction D) 6.5 × 10-10 N in the -y direction E) 6.5 × 10-16 N in the -y direction A) 1.3 × 10-16 N in the +x direction B) 1.3 × 10-16 N in the -x direction C) 6.5 × 10-10 N in the +y direction D) 6.5 × 10-10 N in the -y direction E) 6.5 × 10-16 N in the -y direction

Two charged particles of equal mass are traveling in circular orbits in a region of uniform, constant magnetic field as shown. The particles are observed to move in circular paths of radii R1 and R2 with speeds v1 and v2, respectively. As the figure shows, the path of particle 2 has a smaller radius than that of particle 1. Which one of the following statements about this system is false?

A) |v1/Q1| 2/Q2| B) Particle 2 carries a positive charge. C) Particle 1 carries a negative charge. D) Neither particle gains energy from the magnetic field. E) The particle velocities have no components parallel to the magnetic field. A) |v1/Q1| 2/Q2| B) Particle 2 carries a positive charge. C) Particle 1 carries a negative charge. D) Neither particle gains energy from the magnetic field. E) The particle velocities have no components parallel to the magnetic field.

Exam 21: Magnetic Forces and Magnetic Fields

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the magnitude of the net magnetic force that acts on the loop?

(Multiple Choice)

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Question 21

A long, straight wire is carrying a current of 5.0 A in the direction shown in the figure. The point P is 0.040 m from the wire. -What is the direction of the magnetic field at point P due to the current in the wire?

(Multiple Choice)

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Question 22

Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same direction as shown. -What is the direction of the magnetic field at the point P?

(Multiple Choice)

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Question 23

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field?

(Multiple Choice)

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Question 24

Two charged particles are traveling in circular orbits with the same speed in a region of uniform magnetic field that is directed into the page, as shown. The magnitude of the charge on each particle is identical, but the signs of the charges are unequal. Which one of the entries in the table below is correct?

(Multiple Choice)

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Question 25

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the direction of the net magnetic force that acts on the loop?

(Multiple Choice)

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Question 26

Each second, 1.25 × 10¹⁹ electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

(Multiple Choice)

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Question 27

A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 10⁷ m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10^-¹⁹ C. What is the force on the electron at this instant?

(Multiple Choice)

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Question 28

A coil of wire carries current I as shown in the figure. If the observer could "see" the magnetic field inside this arrangement of loops, how would it appear?

(Multiple Choice)

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Question 29

A single circular loop of wire with radius 0.025 m carries a current of 6.0 A. It is placed at the center of a solenoid that has length 0.60 m, radius 0.075 m, and 1200 turns. -Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla.

(Multiple Choice)

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Question 30

Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of

(Multiple Choice)

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Question 31

A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. -What is the magnitude of the magnetic field at the center of the loop?

(Multiple Choice)

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Question 32

A charged particle is launched with a velocity of 5.2 × 10⁴ m/s at an angle of 35° with respect to a 0.0045-T magnetic field. If the magnetic field exerts a force of 0.0026 N on the particle, determine the magnitude of the charge on the particle.

(Multiple Choice)

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Question 33

A beam consisting of five types of ions labeled A, B, C, D, and E enters a region that contains a uniform magnetic field as shown in the figure below. The field is perpendicular to the plane of the paper, but its precise direction is not given. All ions in the beam travel with the same speed. The table below gives the masses and charges of the ions. Note: 1 mass unit = 1.67 × 10^-²⁷ kg and e = 1.6 × 10^-¹⁹ C -What is the direction of the magnetic field?

(Multiple Choice)

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Question 34

A long, straight, vertical segment of wire traverses a magnetic field of magnitude 2.0 T in the direction shown in the diagram. The length of the wire that lies in the magnetic field is 0.060 m. When the switch is closed, a current of 4.0 A flows through the wire from point P to point Q. -Which one of the following statements concerning the effect of the magnetic force on the wire is true?

(Multiple Choice)

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Question 35

Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle?

(Multiple Choice)

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Question 36

Two charged particles of equal mass are traveling in circular orbits in a region of uniform, constant magnetic field as shown. The particles are observed to move in circular paths of radii R₁ and R₂ with speeds v₁ and v₂, respectively. As the figure shows, the path of particle 2 has a smaller radius than that of particle 1. Which one of the following statements about this system is false?

(Multiple Choice)

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Question 37

A long, coaxial cable, shown in cross-section in the drawing, is made using two conductors that share a common central axis, labeled C. The conductors are separated by an electrically insulating material that is also used as the outer cover of the cable. The current in the inner conductor is 2.0 A directed into the page and that in the outer conductor is 2.5 A directed out of the page. The distance from point C to point A is 0.0015 m; and the distance from C to B is 0.0030 m. The radii a and b of the conductors are 6.0 × 10-4 m and 1.9 × 10-3 m, respectively. -What is the magnitude and direction of the magnetic field at point B?

(Multiple Choice)

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Question 38

The drawing shows two long, thin wires that carry currents in the positive z direction. Both wires are parallel to the z axis. The 50-A wire is in the x-z plane and is 5 m from the z axis. The 40-A wire is in the y-z plane and is 4 m from the z axis. What is the magnitude of the magnetic field at the origin?

(Multiple Choice)

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Question 39

A long, straight wire carries a 6.0-A current that is directed in the positive x direction. When a uniform magnetic field is applied perpendicular to a 3.0-m segment of the wire, the magnetic force on the segment is 0.36 N, directed in the negative y direction, as shown. What are the magnitude and direction of the magnetic field?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 66

Exam 21: Magnetic Forces and Magnetic Fields

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the magnitude of the net magnetic force that acts on the loop?

A long, straight wire is carrying a current of 5.0 A in the direction shown in the figure. The point P is 0.040 m from the wire. -What is the direction of the magnetic field at point P due to the current in the wire?

Two long, straight wires separated by 0.10 m carry currents of 18 A and 6 A in the same direction as shown. -What is the direction of the magnetic field at the point P?

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field?

A long, straight wire carries a 10.0-A current in the +y direction as shown in the figure. Next to the wire is a square copper loop that carries a 2.00-A current as shown. The length of each side of the square is 1.00 m. -What is the direction of the net magnetic force that acts on the loop?

Each second, 1.25 × 1019 electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 107 m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10-19 C. What is the force on the electron at this instant?

A coil of wire carries current I as shown in the figure. If the observer could "see" the magnetic field inside this arrangement of loops, how would it appear?

A single circular loop of wire with radius 0.025 m carries a current of 6.0 A. It is placed at the center of a solenoid that has length 0.60 m, radius 0.075 m, and 1200 turns. -Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla.

Complete the following statement: The magnetic field around a current-carrying, circular loop is most like that of

A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. -What is the magnitude of the magnetic field at the center of the loop?

A charged particle is launched with a velocity of 5.2 × 104 m/s at an angle of 35° with respect to a 0.0045-T magnetic field. If the magnetic field exerts a force of 0.0026 N on the particle, determine the magnitude of the charge on the particle.

Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

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Each second, 1.25 × 10¹⁹ electrons in a narrow beam pass through a small hole in a wall. The beam is perpendicular to the wall. Using Ampere's law, determine the magnitude of the magnetic field in the wall at a radius of 0.750 m from the center of the beam.

A long straight wire carries a 40.0 A current in the +x direction. At a particular instant, an electron moving at 1.0 × 10⁷ m/s in the +y direction is 0.10 m from the wire. The charge on the electron is -1.6 × 10^-¹⁹ C. What is the force on the electron at this instant?

A charged particle is launched with a velocity of 5.2 × 10⁴ m/s at an angle of 35° with respect to a 0.0045-T magnetic field. If the magnetic field exerts a force of 0.0026 N on the particle, determine the magnitude of the charge on the particle.