# Determining the Poles of a Magnet Using a Hall Probe and Lab Equipment

• waley
In summary, the task is to determine the direction of the dipole moment of a magnet with unknown poles using a Hall probe and other commonly found devices in a lab. Possible solutions include measuring the voltage at different points and comparing them, using other bar magnets or a compass needle, or creating a homemade compass needle using a paper clip. However, the lab specifically prohibits the use of these methods and other possible solutions may involve using oscillators, toroids, solenoids, circuit pieces, magnets, DC generators, and gaussmeters.
waley

## Homework Statement

Determine the direction of the dipole moment of a magnet with unknown poles. You are given a Hall probe and can use other devices commonly found in a lab.

## The Attempt at a Solution

I was thinking since the Hall probe uses voltage to determine the strength of the magnetic field at certain places, could I just measure the voltage at these points and compare them? But I wasn't sure how I can use this info to draw a conclusion. Like would the voltage at N be greater than at S?

Is this too simple? Would devices commonly found in the lab include other bar magnets (with poles marked) or a compass needle. You can magnetize a paper clip and suspend it in a jar to make your own compass needle. If you know which way north is, then you know which end of the needle is North.

scottdave said:
Is this too simple? Would devices commonly found in the lab include other bar magnets (with poles marked) or a compass needle. You can magnetize a paper clip and suspend it in a jar to make your own compass needle. If you know which way north is, then you know which end of the needle is North.
I had to paraphrase the question a little, or I'd have to have posted the entire lab. We have to prove this with things we used in the lab: oscillators, toroids, solenoids, circuit pieces, magnets, DC generators, gaussmeters and a couple other things I can't remember. Basically, we can't use any of the "use a compass" or "compare it to another magnet of known polarity" or the paper clip method you mentioned.

## 1. How do you determine the poles of a magnet?

Determining the poles of a magnet can be done in several ways. One method is to use a compass, which will align with the Earth's magnetic field and point to the north pole of the magnet. Another method is to use another magnet, as opposite poles will attract and like poles will repel. You can also use a magnetometer, which is a device that measures the strength and direction of magnetic fields.

## 2. What is the difference between the north and south poles of a magnet?

The north and south poles of a magnet have opposite magnetic properties. The north pole of a magnet will attract the south pole of another magnet, while the north poles of two magnets will repel each other. Similarly, the south pole of a magnet will attract the north pole of another magnet, but repel the south pole of another magnet.

## 3. Can a magnet have more than two poles?

No, a magnet can only have two poles, a north and a south pole. This is because the magnetic field of a magnet is created by the alignment of its atoms, which can only align in two opposing directions.

## 4. How can you determine the strength of a magnet's poles?

The strength of a magnet's poles can be determined by using a magnetometer. This device measures the magnetic field strength and can give an indication of the strength of the magnet's poles. The closer the poles are to each other, the stronger the magnetic field will be.

## 5. Can magnets lose their poles?

Yes, magnets can lose their poles over time. This can happen through exposure to high temperatures, strong magnetic fields, or physical impact. When a magnet loses its poles, it becomes demagnetized and will no longer have the ability to attract or repel other magnets.

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