Review Questions

  1. A wire carries a current, creating a magnetic field around itself as shown.

    The current in the wire is

    1. directed to the right.
    2. directed to the left.
    3. equal to the magnetic field.
    4. in the same direction as the magnetic field.
    5. zero.

  2. Questions 2–3 refer to the following.

  3. A wire carrying a current of 2 A is placed in a magnetic field of 0.1 T as shown.

    The length of wire in the magnetic field is 0.3 m.

    1. The force on the wire is directed

      1. into the page.
      2. out of the page.
      3. toward the top of the page.
      4. toward the bottom of the page.
      5. to the left.

    2. The magnitude of the force on the wire is

      1. 0.06 N.
      2. 2.0 N.
      3. 6.7 N.
      4. 0.15 N.
      5. 0.015 N.

  5. Questions 4–5 refer to the following.

  6. An electron enters a magnetic field as shown.

    1. The electron will experience a force that is initially

      1. into the page.
      2. out of the page.
      3. toward the top of the page.
      4. toward the bottom of the page.
      5. to the left.

    2. The subsequent path of the electron is a

      1. parabola.
      2. straight line.
      3. spiral or helix.
      4. hyperbola.
      5. circle.

  8. For electromagnetic induction to occur,

    1. a magnet must be at rest within a coil of wire.
    2. a coil of wire must be at rest relative to the magnet.
    3. a magnet must move through a coil of wire.
    4. a magnet and a coil must have the same velocity.
    5. a magnet must be pointing north.

  9. A magnet moves into a coil of wire, inducing a current in the wire. If the magnet is pulled back out of the coil in the opposite direction as it went into the coil, which of the following will occur?

    1. There will be a current produced in the coil in the same direction as before.
    2. There will be a current produced in the coil in the opposite direction as before.
    3. There will be no current produced in the coil.
    4. The current produced must be stronger than before.
    5. The current produced must be weaker than before.

  10. A generator

    1. converts mechanical energy into electrical energy.
    2. converts electrical energy into mechanical energy.
    3. converts heat energy into mechanical energy.
    4. converts electrical energy into heat energy.
    5. converts nuclear energy into heat energy.