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STARTER. What is meant by the “North Pole” of the Earth?. Electromagnets Experiment. Part I. The Magnetic Field of a Straight Current-Carrying Wire. 1. Set up the circuit shown: Leave the power off. 2. Use a lantern battery for the power supply. The current will be high

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  1. STARTER What is meant by the “North Pole” of the Earth?

  2. Electromagnets Experiment Part I. The Magnetic Field of a Straight Current-Carrying Wire 1. Set up the circuit shown: Leave the power off.

  3. 2. Use a lantern battery for the power supply. The current will be high (several amps) so do not touch the bare wire when the circuit is on. 3. Turn the circuit on, a note the compass direction. Then turn the current off. Start a sketch as shown. Note that you are looking down onto the platform. ( If they are available, place several small compasses all around the wire.) 4. Complete a sketch showing the wire, the current direction, and the B- field around the wire.

  4. Electromagnets Experiment Part II. The force on a current-carrying wire in a B-field 1. Construct the following apparatus from copper wire. The bottom wire should swing freely in the supports. Do not turn on the power supply until your apparatus has been inspected.

  5. Momentarily turn on the power and watch the wire carefully. Turn the power off. Record your observation. Draw a picture that shows the current direction in the wire, the B-field direction from the magnet, and the direction of the observed force on the wire. Repeat the procedure with the South pole of the magnet near the wire, instead of the north. Draw another picture that shows the current direction in the wire, the B-field direction from the magnet, and the direction of the observed force on the wire.

  6. Electromagnets Experiment Part III. Construct your own electromagnet using an iron nail as the core. 1. Map the field lines around the magnet. Make an accurate drawing. 2. Experiment and find out which items your magnet will attract.

  7. Lab Report Items a. A drawing of the B-field lines around your current carrying wire showing the current direction and the B-field lines with arrows showing the direction. b. The rules for Interaction of current-carry wire and an external magnetic field and the drawings of your apparatus with current, B-field , and Force directions shown. c. A picture of your nail electromagnet and the magnetic field around it.

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