# homework10 - Physics 321 Autumn Quarter 2015...

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Physics 321, Autumn Quarter 2015 Electrodynamics: Homework Assignment 10 (a) Turn in all problems and clearly note all constants and assumptions you use. (1-point penalty each otherwise) (b) Use 8 ½ x 11 paper & staple (1-point penalty each otherwise) Due 9:30 am Thursday December 10 1. Consider a capacitor consisting of an inner conducting cylinder of radius R 1 and an outer conducting cylinder of radius R 2 . The length of the capacitor is L . The region between the conductors consists of a dielectric with permittivity ε . The plates are charged to ± Q . Assuming no fringing fields. (a) Find the E and D fields everywhere. (b) Find the capacitance. (c) Now connect a constant voltage source V across the terminals of the capacitor. Then you displace the dielectric a very slight distance along the axial direction. Find the magnitude of the force and the direction of the force needed to hold the dielectric in this displaced position. 2. Consider a spherical capacitor of inner radius

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• Spring '16
• Laumann
• Magnetism, Work, Electric charge, Permittivity, Dielectric, permittivity ε

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