When a material body moves across a magnetic field a potential difference is generated between the opposite sides of the body. The value of this potential difference depends directly upon the velocity, the strength of the magnetic field that is being cut, and upon the dimensions of the body.
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Boon, John D.
"The Potential Generated In A Falling Meteorite,"
Field and Laboratory: Vol. 10
Available at: https://scholar.smu.edu/fieldandlab/vol10/iss2/5