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cairoliu
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As the permanent magnet is magnetized by donut shape coil, thus field B = 0 outside.
How can I know if seller screwed me or not?
How can I know if seller screwed me or not?
You test it the same way you test Write-Only Memory.cairoliu said:As the permanent magnet is magnetized by donut shape coil, thus field B = 0 outside.
How can I know if seller screwed me or not?
Is it a pretty paperweight?cairoliu said:There no N & S polar for the donut magnet.
If I cut into 2 semi circles, then there are N & S polars. But I will keep it integral.
About a few of ounces made of NdFeBberkeman said:Is it a pretty paperweight?
You are kidding me. No such thing of write-only memory.berkeman said:You test it the same way you test Write-Only Memory.
Yes, but the object you are asking about seems to be of about as much use as write-only memory...cairoliu said:You are kidding me. No such thing of write-only memory.
I back-order it by customization in the purpose of experiment of the simplest motor - no windings, only a straight conducting axle as described in previous text. Is there torque anyway?berkeman said:Yes, but the object you are asking about seems to be of about as much use as write-only memory...
No torque even 2 fighting fields in opposite directions? But, moving a bar magnet with N polar toward the N of another bar magnet, the other bar will be pushed backward.Charles Link said:I think all you can succeed...As for making a motor out of it, I think you are likely to get zero motion of this thing. There simply isn't any torque of any significance.
That is speculation, which is not allowed at the PF. This thread is done.cairoliu said:One day, the room temperature superconductor age will come, even 2000A current just small deal, then, this simplest motor can be put in applications.
To test the strength of the inside field of a toroidal permanent magnet, you can use a gaussmeter or a hall-effect probe. Place the probe at different points inside the toroid to measure the field strength. The strongest point will indicate the strength of the inside field.
The most accurate way to test the polarity of a toroidal permanent magnet is by using a compass. Place the magnet near the compass and observe the direction the needle points. The end of the magnet that points towards the north is the north pole of the magnet.
No, a multimeter is not suitable for testing a toroidal permanent magnet. Multimeters are designed to measure voltage, current, and resistance, not magnetic fields. You will need a gaussmeter or a hall-effect probe for accurate testing of a toroidal permanent magnet.
To determine the magnetic field distribution inside a toroidal permanent magnet, you can use a 3D magnetic field scanner or a 2D magnetic field mapping system. These tools can provide a visual representation of the magnetic field strength at different points inside the toroid.
Yes, it is important to demagnetize a toroidal permanent magnet before testing to ensure accurate results. The magnet can be demagnetized by heating it above its Curie temperature or by using a degaussing coil. This will reset the magnetic domains and remove any previous magnetization, providing accurate test results.