Magnetic fields are invisible to the naked eye, so viewing and measuring them is impossible without additional materials or tools. We’ll look at magnetic fields one way in the pre-lab, and another way during this lab. Inspiration for this lab comes from this paper (Measurement of the magnetic field of small magnets with a smartphone).
- Put the Bar Magnet on your lab table.
- Place the piece of paper over the magnet
- Slowly shake iron filings over the piece of paper. Imagine you’re trying to lightly sprinkle sugar over strawberries.
- Tap the piece of paper gently, twice.
- Draw what you see in your lab notebook.
Smart phone with magnetometer
- Draw a line down the center of the paper.
- Place the magnet under the paper, on the line.
- Begin logging data from internal magnetometer using SPARKvue app
- Move the phone around the paper until the magnetometer reading peaks. Mark that on the paper.
- Move the smartphone 1cm away from your body.
- Record the magnetometer reading.
- Repeat steps 5 and 6 20 times.
- Plot the data.