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Unformatted text preview: Name:________________________________ Posting Code: ___ ___ ___ Physics 4B FINAL EXAM Spring 1987 Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 10 points. You must show your work in a logical fashion starting with the correctly applied physical principles. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. The earth has a total charge of - 451 kC. (a)Is there net electric flux landing on earth or leaving earth ? (b)Find the total amount of this electric flux. (c)Find the flux that leaves or enters Bidwell Park which has an area of 2400 acres ( 9.7 km 2 ). The radius of the earth is 6.4 x 10 6 m. What do you need to assume to do part (c) ? 2. Find (a)the electric potential at the center of the semi-circular ring of radius, a, and total charge,Q, shown below and (b)the electric field at this point.electric field at this point....
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