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practicetest1 07

# practicetest1 07 - P114 CLASS TEST#1A PRINT NAME UR ID Prof...

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P114 CLASS TEST #1A Prof. Cline PRINT NAME UR ID# 1. ________ 2. ________ 3. ________ TOTAL _________ 4. ________ 1. DO NOT SIT NEXT TO A STUDENT WITH THE SAME COLOR TEST. 2. THIS IS A CLOSED BOOK EXAM 3. Print your name on each sheet 4. Do all problems - Problems 1-4 count for 25 points each. 5. Answer on the sheet containing the problem - use the back if necessary. 6. Making a diagram when appropriate usually aids in solving the problem. 7. Circle your answers and give units when appropriate. 8. Necessary constants and formulae are given on the last page of the exam. 9. Calculators are allowed. 10. Show all steps to get full credit 1

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1: A uniformly charge sphere has a charge Q = +2 Coulombs and radius R = 10 cm. Show all steps to get full credit . a;(6pts) Derive the magnitude and direction of the E fi eld outside the surface of the sphere. b;(6pts) Derive the magnitude and direction of the E fi eld inside the sphere. c;(8pts) Derive the electric potential di ff erence of the outer surface of the charged sphere relative to r = d;(5pts) An electron of charge e = 1 . 60 × 10 19 C starts at rest at in fi nity and is attracted towards the charged sphere. What is the kinetic energy when the electron strikes the surface of the charged sphere? State the units used.
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