Nothing matters a lot
An electromagnetic field can exert a force on a charged particle. The expression for this force, viz. the Lorentz force, is given by q(E +v×B). This tells you that, if E and B vanish, then there is no force. Similarly, we do not expect any Lorentz force to arise when there are no charged particles. All these sound quite reasonable.
KeywordsHarmonic Oscillator Lorentz Force Ground State Energy Relative Probability Casimir Force
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