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Author Topic: An Experiment with compass needle  (Read 10271 times)

MagnaProp

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Re: An Experiment with compass needle
« Reply #15 on: April 08, 2016, 09:39:13 PM »
Quote from: vineet_kiran on April 08, 2016, 12:06:48 PM
...The needle should not move out of the magnetic field.    When disc is rotated w.r.t. earth's magnetic field the needle does not move out of earth's magnetic field because it covers the entire earth...
The needle crosses the bloch wall so I'm not sure that is considered staying in a constant magnetic field? I would expect more pull on one side of your needle if we moved closer to the north or south pole of the earth. I think the earths magnetic field is a fairly constant pull on both sides of a magnet because of how far apart the poles are with respect to our location. We are fairly close to being in the center of these large poles.

To get a fairly even magnetic field in your device I think your large magnet under the disk would have to be very large. If the main disk is six inches diameter, then I think your large magnet under it would have to be about four feet square or more to get a fairly constant field pull on the needle. Worth testing and thanks for sharing this unique idea.
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vineet_kiran

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Re: An Experiment with compass needle
« Reply #16 on: April 09, 2016, 02:16:55 AM »
Quote from: MagnaProp on April 08, 2016, 09:39:13 PM
The needle crosses the bloch wall so I'm not sure that is considered staying in a constant magnetic field? I would expect more pull on one side of your needle if we moved closer to the north or south pole of the earth. I think the earths magnetic field is a fairly constant pull on both sides of a magnet because of how far apart the poles are with respect to our location. We are fairly close to being in the center of these large poles.

To get a fairly even magnetic field in your device I think your large magnet under the disk would have to be very large. If the main disk is six inches diameter, then I think your large magnet under it would have to be about four feet square or more to get a fairly constant field pull on the needle. Worth testing and thanks for sharing this unique idea.


I agree with that.  Thanks for the positive input.
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lumen

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Re: An Experiment with compass needle
« Reply #17 on: April 09, 2016, 02:51:43 AM »
Now the external field will remain constant with the generator central.
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vineet_kiran

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Re: An Experiment with compass needle
« Reply #18 on: April 09, 2016, 03:16:06 AM »
Quote from: lumen on April 09, 2016, 02:51:43 AM
Now the external field will remain constant with the generator central.


It cannot be Sir!
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