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Magnetic Needle on Stands (pair)

Product Name: Magnetic Needle on Stands (pair)
Model NO.: PE041

Product Details: Magnetic Needle on Stands (pair)

It is used for demonstrating the reciprocal interaction of the magnetic poles. The needle is mounted on a base. There is a small hole in the middle of the needle, so that a vertical axle can hold the needle through the hole. The needle can rotate freely on the pivot.
How to use:
demonstrate the direction of the needle: turn the needle gently; after it stops, one end always faces south and the other north.
demonstrate the interaction of the magnetic poles: the two poles repel when they have same polarity; the two poles attract when they have opposite polarities.
compare the magnetic strengths: by putting two or more magnets at the same place near the needle to see the speed it turns.
check if there is a current in a cable and if yes, the direction of the current: place the needle near the cable to see if there is a bias of the needle; if yes, adopt Ampere Right Hand Principle to determine the direction of the current.
Maintenance
when not in use, please don't put it with other magnets. Don't expose it to strong magnets.
please don't place it in an place that is heated or vibrating violently.
please don't place two poles of same polarity together.