Phys 2B Usyd 2025

Physics

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Sample Data

Front \(\epsilon_0 \)units in context of Coulombs Law
Back \(c^2N^{-1}m^{-2}\) (\(c^2\) is Coulombs squared)
Front How to sum up a collection of charges within a Gaussian surface?
Back \(Q_{enclosed}=\sum Q_i\)
Front What are 2 things we can do to simplify the following equation in the context of Gaus's law around a spherically symmetric charged sphere? \(\oint E_r(r)dA?\)
Back By radial symmetry, \(E_r \) takes the same value at all points, so can be re-written as \(E(r) \oint dA\), and \(\oint dA\) is simply the surface area of a sphere \(4\pi r^2\)
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