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My calc based physics class is covering Lenz's law.
They get that the law is about the inducing a current
which causes an opposite induced magnetic field.
They want to use the right hand rule to figure out the
direction of this induced current.
One book uses your fingers, another book uses the thumb
for current. One book throws an area vector in the direction of your thumb.
For a loop of current how do you know which way the palm of your hand faces...