The Ultimate Test of Atom and Neutron Neutrality

Researchers from Stanford University have proposed a new way to test the neutrality of an atom and even a neutron, a method they say will be far more sensitive than current methods, able to probe the charge of an atom or neutron down to an unbelievably small fraction of the electron charge, e.

This experiment will help answer important questions about charge quantization. Why does the charge appear in units of the electron charge? Why do some particles have no charge? Do the electrons and protons in an atom really cancel out to zero charge?

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