Materials

• A magnet

• A long piece of thread

• A dollar bill

Procedure

1. Tie your magnet on the piece of thread and hang it off the ceiling close to a wall. 

2. Pin a piece of paper on the wall right behind the magnet and draw a line as an extension to the thread. 

3. Use a dollar bill and put it near the magnet and see what happens.

Observation

The dollar bill attracts the magnet.

Explanation

All of the black ink in our currency is magnetic. That way a magnetic scanner can easily identify if a bill is real or fake.