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40
Intensifying the
magnetic force
even more
YOU WILL NEED
→ iron rod
→ wire
→ compass
→ 1.5-volt battery (AA)
→ tape
→ sheet of letter-size paper
HERE'S HOW
1. Disassemble the wire again and create a
narrow coil out of it by winding it about
15 times around the iron rod.
2. Tape the coil to the paper and set the
compass in front of it. Let the current
flow briefly.
How does the compass react?
3. Now push the iron rod into the coil
and briefly let the current flow again.
EXPERIMENT 28
1
2
3
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