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Act.02.11 - the electric field the same as in(ii or...

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Physics 2102, February 11, 2011. Activity 1 Figure (a) shows 12 electrons that are equally spaced and fixed around a circle of radius R . (a) (b) (i) Relative to V = 0 at infinity, what is the electric potential at the center C of the circle due to the electrons? (ii) What is the magnitude of the electric field at the center of the circle? (iii) In figure (b) the electrons are moved along the circle until they are non-uniformly spaced over a 120 degree arc, as shown below. What is now the electric potential at the center of the circle? Is the magnitude of
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Unformatted text preview: the electric field the same as in (ii) or different? Activity 2: The figure shows an alpha particle, consisting of two protons and two neutrons, traveling head-on toward a positively charged gold nucleus (79 protons). At a distance of r, the alpha particle comes to a momentary stop and then it reverses its path. Calculate the kinetic energy of the alpha particle when it was very far away from the gold nucleus. (This problem is about energy conservation – think about what the initial (far away) and final kinetic and potential energies are)....
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