University Physics Volume 2

# Conceptual Questions

University Physics Volume 2Conceptual Questions

### 11.2Magnetic Fields and Lines

1.

Discuss the similarities and differences between the electrical force on a charge and the magnetic force on a charge.

2.

(a) Is it possible for the magnetic force on a charge moving in a magnetic field to be zero? (b) Is it possible for the electric force on a charge moving in an electric field to be zero? (c) Is it possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero?

### 11.3Motion of a Charged Particle in a Magnetic Field

3.

At a given instant, an electron and a proton are moving with the same velocity in a constant magnetic field. Compare the magnetic forces on these particles. Compare their accelerations.

4.

Does increasing the magnitude of a uniform magnetic field through which a charge is traveling necessarily mean increasing the magnetic force on the charge? Does changing the direction of the field necessarily mean a change in the force on the charge?

5.

An electron passes through a magnetic field without being deflected. What do you conclude about the magnetic field?

6.

If a charged particle moves in a straight line, can you conclude that there is no magnetic field present?

7.

How could you determine which pole of an electromagnet is north and which pole is south?

### 11.4Magnetic Force on a Current-Carrying Conductor

8.

Describe the error that results from accidently using your left rather than your right hand when determining the direction of a magnetic force.

9.

Considering the magnetic force law, are the velocity and magnetic field always perpendicular? Are the force and velocity always perpendicular? What about the force and magnetic field?

10.

Why can a nearby magnet distort a cathode ray tube television picture?

11.

A magnetic field exerts a force on the moving electrons in a current carrying wire. What exerts the force on a wire?

12.

There are regions where the magnetic field of earth is almost perpendicular to the surface of Earth. What difficulty does this cause in the use of a compass?

### 11.6The Hall Effect

13.

Hall potentials are much larger for poor conductors than for good conductors. Why?

### 11.7Applications of Magnetic Forces and Fields

14.

Describe the primary function of the electric field and the magnetic field in a cyclotron.

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