problem22_29

University Physics with Modern Physics with Mastering Physics (11th Edition)

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22.29: a) Gauss’s law says + Q on inner surface, so 0 = E inside metal. b) The outside surface of the sphere is grounded, so no excess charge. c) Consider a Gaussian sphere with the – Q charge at its center and radius less than the inner radius of the metal. This sphere encloses net charge – Q so there is an electric field flux through it; there is electric field in the cavity. d) In an electrostatic situation 0 = E inside a conductor. A Gaussian sphere with the
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Unformatted text preview: Q-charge at its center and radius greater than the outer radius of the metal encloses zero net charge (the Q-charge and the Q + on the inner surface of the metal) so there is no flux through it and = E outside the metal. e) No, = E there. Yes, the charge has been shielded by the grounded conductor. There is nothing like positive and negative mass (the gravity force is always attractive), so this cannot be done for gravity....
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