Workshop Tutorials for Physics 1.docx - Workshop Tutorials for Physics Solutions to ER1 Charge and Coulomb’s Law A Qualitative Questions 1 The

Workshop Tutorials for Physics 1.docx - Workshop Tutorials...

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Workshop Tutorials for Physics Solutions to ER1: Charge and Coulomb’s Law A. Qualitative Questions: 1. The following effects are fundamentally electrical in nature: a. tension in a spring – this is due to the distortion of bonds in the spring, which are electrical in nature. b. “crackles” when you take clothes off – this is due to buildup of charge on the garment c. “crackles” from walking on dry leaves – as in a, this is due to breaking and distortion of bonds in the leaves, so this is also electrical in nature. e. nerve conduction – relies on the movement of ions across cell membranes g. the auroras – are due to charged particles becoming trapped in the Earth’s magnetic field. h. pressure in a gas is due to the electrical repulsion of the molecules. The following are not electrical in nature: d. the spiral structure of galaxies – is due to gravitational forces f. nuclear fission – the strong nuclear force holds nuclei together, although the energy released in nuclear fission comes from the electric force which drives the pieces apart. kq 1 q 2 2. Coulomb’s law for electrostatics: F E = r 2 . kq 1 q 2 k ( e )(2 e ) The force on one electron in the helium atom due to the nucleus is F = r 2 = r 2 , where r is the distance from the nucleus to the electron, -e is the charge on the electron and +2 e is the charge of the nucleus due to the two protons it contains.
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