690_Physics ProblemsTechnical Physics

690_Physics ProblemsTechnical Physics - 30 Gausss Law Q24.8...

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30 Gauss’s Law Q24.8 Consider any point, zone, or object where electric field lines begin. Surround it with a close-fitting gaussian surface. The lines will go outward through the surface to constitute positive net flux. Then Gauss’s law asserts that positive net charge must be inside the surface: it is where the lines begin. Similarly, any place where electric field lines end must be just inside a gaussian surface passing net negative flux, and must be a negative charge. Q24.9 Inject some charge at arbitrary places within a conducting object. Every bit of the charge repels every other bit, so each bit runs away as far as it can, stopping only when it reaches the outer surface of the conductor. Q24.10 If the person is uncharged, the electric field inside the sphere is zero. The interior wall of the shell carries no charge. The person is not harmed by touching this wall. If the person carries a (small) charge q , the electric field inside the sphere is no longer zero. Charge – q is induced on the inner wall of the sphere. The person will get a (small) shock when touching the sphere, as all the charge on his
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