# _004 - Solution for Homework 3 Beginning Electric Fields...

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Solution for Homework 3 Beginning Electric Fields Solution to Homework Problem 3.1(Field Type) Problem: Consider a feld with the Following Form at all points in space: v E ( x, y, z ) = (50 N C , 50 N C , 0) . Which oF the Following best describes the feld? Select One oF the ±ollowing: (a) Radial (b-Answer) UniForm (c) Point charge feld (d) Line charge feld (e) None oF the above Solution (b): The feld given is a uniForm electric feld (keywords: all points in space ). Total Points for Problem: 2 Points Solution to Homework Problem 3.2(Can Electric Field be Zero Between Two Point Charges of Given Sign and Magnitude?) Problem: Two point charges with magnitudes oF 2 q and q are located a distance r apart. (a)IF the two charges have opposite signs, is there any point on the line connnecting the charges at which the net electric feld is zero? Select One oF the ±ollowing: (a) Yes (b-Answer) No (b)IF the two charges have the same sign, is there any point on the line connnecting the charges at which the net electric feld is zero? Select One oF the ±ollowing: (a-Answer) Yes (b) No Solution to Part (a) No. IF the charges have opposite sign, the electric feld oF both charges point in the same direction, and there is no point oF zero feld. Grading Key: Solution to Part (a) 2 Points Solution to Part (b) 1

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Yes. The felds point in opposite directions between the charges. There will be a point where they exactly cancel. Grading Key: Solution to Part (b) 2 Points Total Points for Problem: 4 Points Solution to Homework Problem 3.3(Comparison of Electric Field Magnitudes For Dif- ferent Systems of Charges) Problem: The fgure shows Four di±erent systems with Four charged particles each. Arrange the sys- tems in order oF the magnitude oF net electric feld at the central point due to the Four charges.
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## This note was uploaded on 05/04/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.

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_004 - Solution for Homework 3 Beginning Electric Fields...

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