The nucleus of a 125Xe125Xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fmfm in diameter. It has 54 protons and charge q=+54e�=+54� (1 fmfm = 1 femtometer = 1×10−15m1×10−15m.) Hint: Treat the field of the spherical nucleus as that of a point charge at the center. What is the electric force on a proton 1.0 fmfm from the surface of the nucleus? What is the proton's acceleration?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.