How Can You Make a Horseshoe Electromagnet?

You will use:

     Long, thin bolt (or U-Bolt)
     Insulated copper wire
     Dry Cell
     Switch
     Small nails paper clips

Do this: 

1.Wind several layers of wire around one arm, then other, of a  U-Blot. (Such a blot, if unobtainable, may be made by bending a long thin bolt into a U-Shape, using a vise)

2.Strip the insulation form the ends of wire.

3.Connect one end of a  piece of wire to one terminal of the dry cell, and the other end to the terminal of the switch.

4.Connect a second piece of wire between the dry cell and the switch.

5.Close the switch. How many paper clips or nails can you pick up your horseshoe lectromagnet?

6.Open the switch. What happens? Try this several times.

Why it works:

     We already know why an electromagnet works.

     We are now able to take advantage of an electromagnet shaped like horseshoe?

     We are now able to take advantage of magnetism produced in both ends,  or poles, of both electromagnet. When both poles are near each other, we get up twice the strength that a straight bolt gives- if the number of turns of wire is the same on each side.