The pins should point in opposite directions and hang horizontally. Push the thread through the straw. Tape the thread to the top so that the pins have just enough clearance to swing freely at the bottom. Stroke the pins from left to right several times with a permanent magnet. Establish and mark the north-seeking end.
Magnetometers are devices used to detect and measure the strength of magnetic fields.
Compasses are basically magnetometers with directions marked on them. A magnetometer will dip or point toward a source of magnetism. Have students use their magnetometer to find things in your room or at home that are magnetic. All Rights Reserved.