Chapter 20
1. (p.616 prob.10) An electron experiences the greatest force as it travels 1.8 x 10m/s in a magnetic field when it is moving southward. the force is upward and of magnitude 2.2 x 10N. what is the magnitude and direction of the magnetic field?
2. (p.616 prob.11) The magnetic force per meter on a wire is measured to be only 45 percent of its maximum possible value. Sketch the relationship of the wire and the field if the force were a maximum, and sketch the relationship as it actually is, calculating the angle between the wire and the magnetic field.
3. (p.617 prob. 24) What is the acceleration ( in g's) of a 175-g model airplane charged to 18.0C and traveling at 1.8m/s as it passes within 8.6cm of a wire, nearly parallel to its path, carrying a 30-A current?
4. (p.618 Prob.33) Two long wires are oriented so that they are perpendicular to each other, and at their closest, they are 20.0cm apart (Fig. 20-55). What is the magnitude of the magnetic field at a point midway between them if the tip one carries a current of 20.0A and the bottom one carries 5.0A?