Evaluate the electric field at the centre of a square
Determine the scalar potential due to a 1m-long horizontal line of charge with 10mC total charge. Use this result to evaluate the electric field at the centre of a square constructed from four of these lines of charge.
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Two charges repel each other r with a force of 10^ -6N when they are 10 cm apart. When they are brought closer together until they are 2 cm aprt, the force between them becomes:
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An ionic solid contains cation vacancies, anion vacancies, and cation interstitials. Compute the relative concentrations of all of the defect species. Assume that the cations and anions are monovalent.
The cable is encased in a thin-walled pipe of 0.1-meter diameter, and to render the cable superconducting (essentially zero power dissipation), the space between the cable and pipe is filled with liquid nitrogen at 77 K.
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A tank of compressed oxygen gas at a doctor's office has a pressure of 105 times atmospheric pressure. If the volume of the tank is 525 cm3, how many oxygen molecules does it contain? Answer in molecules.
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