Sample Exam 2 - ENEE 380 Fall 2011 Sample Exam Problems...

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ENEE 380 Fall 2011 October 30, 2011 Sample Exam Problems 1. A one-dimensional device consisting of a linear dielectric with dielectric constant r is charged with a charge density given by o xa  . If 0 E at 0 x and 0 V at , find  Vx and x E . Determine the bound polarization charges and their location in the dielectric. 2. Current-carrying components in high-voltage power equipment can be cooled to carry away heat caused by ohmic losses. A means of pumping, called electrohydrodynamic pumping, is based on the force transmitted to the cooling fluid in an electric field. The region between two electrodes, separated by a distance d , contains a uniform charge density o which is generated at the left electrode and collected at the right electrode. A potential o V is applied between the electrodes. The net force exerted on the fluid by the charge in the electric field is given by V d FE  . Calculate the pressure of the pump if 3 25 o mC m and 22 o V k V .
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Sample Exam 2 - ENEE 380 Fall 2011 Sample Exam Problems...

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