Electromagnetic Induction

Problems

practice

  1. Write something.
  2. Write something.
  3. Write something.
  4. Write something completely different.

conceptual

  1. The diagram below shows a segment of a wire as it moves through a region of uniform magnetic field B. Show the direction of the induced current flow through the wire.

  2. In what direction should the wire be moved through the magnetic field so as to induce the current indicated in the diagram below?

  3. The diagram below shows the instantaneous position of a rotating loop of wire between two bar magnets. The loop is rotating clockwise when viewed from P. The magnets and the loop all lie in the same plane. Indicate the direction of induced current flow in the loop.

  4. Some roads have large wire loops embedded in them just below the surface. The loops are about the size of a car, are oriented horizontal, and lie just below the surface of the pavement.
    1. Describe the probable effect that driving a car over the loop would have on the loop.
    2. What additional equipment would be needed to detect this effect?
    3. What practical application might such a device have?
  5. A pair of related questions.
    1. How are an electric motor and electric generator similar? How are they different?
    2. How are a speaker and microphone similar? How are they different?
  6. Why is wearing headphones outside during a thunderstorm a bad idea? Note: The answer is not that the headphones "attract" lightning.
  7. Why do electric motors burn out if they are switched on but not allowed to rotate?

The Physics Hypertextbook

  • No condition is permanent.