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August 7, 2010
News - ATP: Hall Effect and Lore…
about 2 months ago
did it in college 45 years ago and worked.
to make it work i used;
A bar magnet worked best due to shape of the field. Field shape and alignment will be critical.
To get around possible induction I made an adjustable wooden holder (glue only) so the magnet would not be moving and carefully taped down all wires out to 6 inches.
Once done the OP amp produced a steady offset proportional to the current and the distance of the magnet.
Proving changing distance worked.
The math from these measure followed Lorentz law as expected.
As a secondary proof of the field to current ratio;
I made a saw tooth oscillator for the current source and you could see the ramp on the scope from the OP amp output. Showing the effect of changing current. My prof really liked that idea.
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