# HW 5 - Lehigh University Physics 21 Spring 2010 Home Work...

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Lehigh University January 27, 2010 Physics 21, Spring 2010 Home Work Assignment 5 Note: Solutions to the problems must be submitted on WileyPLUS (www.wileyplus.com). HW-5 due February 3, 2010 (12 AM online) HW5-1(Chapter 24 Q3) In Fig. 24.23, eight particles form a square, with distance d between adjacent particles. What is the electric potential at point P at the center of the square if the electric potential is zero at infinity? HW5-2 (Chapter 24 P1) Much of the material making up Saturn's rings is in the form of tiny dust grains having radii on the order of 10 –6 m. These grains are located in a region containing a dilute ionized gas, and they pick up excess electrons. As an approximation, suppose each grain is spherical, with radius R = 1.3 x 10 –6 m. How many electrons would one grain have to pick up to have a potential of –490 V on its surface (taking V = 0 at infinity)? HW5-3 (Chapter 24 P9)The electric field in a region of space has the components E y = E z = 0 and E x = (3.20 N/(C·m)) x . Point A is on the y axis at y = 4.40 m, and point B is on the x axis at x = 5.90 m. What is the potential difference (in V)

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