Exercises and Homework for Tuesday, January 25.
[1] Determine whether the nail in your box is magnetized. How can you tell if it is?
[2] You have a small coil of wire (held together with tape) in your kit. Wrap this around your nail, leaving a bit of the wire free at each end of the wrapping.
[3] Using your alligator clips, hook the two sides of your battery pack to the two ends of the wire wrapped around the nail. There will now be current flowing through the wire.
[4] Is your nail magnetized now? If so, where are its poles?
[5] Switch the two connections from the battery. Does this change the position of the nail's poles?
[6] By wrapping your wire around this nail, you have made an electromagnet. Is your electromagnet strong enough to pick up a paper clip?
[7] When you disconnect the battery pack from your wire, is the nail still able to pick up a paper clip? What does this mean?
[8] One of the drawings below is a correct representation of your electromagnet, and one is not. Which one shows the correct relationship between the north and south poles and the direction in which the nail is wrapped?
SHAPE \* MERGEFORMAT
[9] Reconnect your battery so that current once again flows through the coil. Carefully slide the nail out of the coil. Does the coil itself {without the nail in it} still act like a magnet?
[10] As homework for Thursday the 27th, do Exercise 2.2 on p. 534 (Volume II) of McDermott.