Surely a magnet has to stop attracting at some point? Is that an inexhaustible source of energy?
Or am I seeing that completely wrong?
Asker: Frank, 44 years old
Answer
A magnet’s magnetic pull “never runs out”, unless you change its spin and/or atomic structure – you do this by heating it up, dropping it, or magnetizing it with another strong magnetic field.
Magnetic attraction, like gravity, is not a source of energy, but a “force”.
A force produces energy only if the attracted object moves in the direction of the force, according to the formula Energy = Force * Displacement.
Answered by
Engineer Bart Dierickx
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