Finding north with copper wire

In summary, to figure out which way is north when lost with only a copper wire and voltmeter, make a loop with the wire and voltmeter leads and orient it vertically. While standing up, rapidly turn around at a constant speed and observe the voltmeter for maximum deflection. The point of maximum deflection corresponds to north, as the Earth's magnetic flux through the loop changes at its fastest rate.
  • #1
MmeCurie
1
0
How do you figure out which way is north when you're lost and the only things you've got with you is a copper wire and a voltmeter?

Thanks in advance.
 
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  • #2
MmeCurie said:
How do you figure out which way is north when you're lost and the only things you've got with you is a copper wire and a voltmeter?

Thanks in advance.

1. What happens when you wave a copper wire about in a magnetic field?
2. When is this effect most and when is it least?

Answer those two questions and you're on the way to a solution.
 
  • #3
MmeCurie said:
How do you figure out which way is north when you're lost and the only things you've got with you is a copper wire and a voltmeter?

Thanks in advance.
Make a loop of the largest area that you can make with the copper wire and voltmeter leads (connected to the voltmeter) using your arms while orienting the loop vertically. Then, standing up, turn around as fast as you can but at constant rotational speed while watching the voltmeter.

Since the Earth's magnetic flux through the loop is changing as you turn, there will be an induced emf around the loop. The magnitude of that induced emf is proportional to the rate of change of that flux. At what point in your turn (letting 0 degrees be due magnetic north) will the time rate of change of magnetic flux be maximum (ie. where you will observe maximum deflection of the voltmeter)? Figure out north from that.

AM
 

1. How does using copper wire help in finding north?

Using a copper wire to find north relies on the principle of electromagnetism. When the wire is placed in the Earth's magnetic field, it becomes magnetized and can be used as a compass needle to indicate the direction of north.

2. Can any type of copper wire be used for this method?

Yes, any type of copper wire can be used as long as it is long enough to hold and has some flexibility. Thicker wires may be easier to handle, but thinner wires can also work.

3. How accurate is this method of finding north?

This method can provide a general indication of north, but it may not be as accurate as using a traditional compass. Factors such as the strength of the Earth's magnetic field and the length and thickness of the wire can affect the accuracy.

4. Are there any safety precautions to consider when using this method?

Yes, it is important to be careful when handling the wire as it can become magnetized and may attract metal objects. It is also important to avoid using this method near power lines or other sources of electricity.

5. Can this method be used in any location?

Yes, this method can be used in any location as long as there is a strong enough magnetic field present. However, it may not be as effective in areas with high levels of interference or areas near the Earth's poles where the magnetic field is weaker.

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