Recitation Worksheet S Solutions

# Recitation Worksheet S Solutions - Worksheet S Gauss's law...

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Worksheet S: Gauss’s law. - 1 - 1. Three spherical Gaussian surfaces enclose a charge + Q . In case C, there is another charge 6 Q outside the surface. Consider the following conversation: Student 1: “Since each Gaussian surface encloses the same charge, the net flux through each must be the same.” Student 2: “Gauss’s law doesn’t apply here. The electric field at the Gaussian surface in case B is weaker than in case A, because the surface is farther from the charge. Since the flux is proportional to the electric field strength, the flux must be smaller in case B.” Student 3: “I was comparing A and C. In C the charge outside changes the field over the whole surface. The areas are the same, so the flux must be different.” Do you agree with any of the students? For the students that you think are wrong, what part of their reasoning is incorrect? Student 1 is right. Gauss’s law applies anytime you have a closed surface. Student 2 is right about

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Recitation Worksheet S Solutions - Worksheet S Gauss's law...

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