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Discoveries leading to the Right Hand rule
Hans Christian Ørsted made this famous observation in 1819.
Testing the direction of force when the current carrying wire is above vs. below a compass. What does this tell us?
Apply current in both directions and notice the response is different.
Applying current in various directions to a single loop of wire. Primitive electric motor?
Simple device which we can use to measure our homemade batteries. You can test it with any household battery first. What does this deflection represent? What forces are involved?