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A change of quantum states for a quantum particle may lead to a change ofphysical field it exerts to the environment. We discuss such Gedankenexperimentfor measuring the magnetic dipole fields associated with the electronic spins.When entangled, electrons are no longer free Dirac electrons but become anexcited state in a quantum-electrodynamics sense. A measurement of magnetismassociated with entanglement-collapse of electrons becomes a test forCopenhagen interpretation in the reign of quantum-electrodynamics. Thisproposal is equally applicable to other particles and their associated fieldsand interactions, such as neutrons and the electroweak force.

Spontaneous magnetism after a "remote" quench: a proposal to test Copenhagen interpretation