VA P1520 Electric Forces x r Chegg Study Guided Sc x X a C Secure h ps://www.web
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VA P1520 Electric Forces x r Chegg Study Guided Sc x X a C Secure h ps://www.webassign.net/ 5308765 web/Student/Assignment-Responses/last?dep Assignment submission For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer. Assignment scoring You last submission is used for your score. My Notes 2 points Previous Answer BU Elem Phys 6 P022 Three balls, with charges of +4a, 20, and -ar are equally spaced along a line. The spacing between neighboring balls is r. We can amange the balls in three different ways, as shown in the figure In each case the balls are in an isolated region of space very far from anything else. (a) Rank the three cases, from largest to smallest, based on the magnitude of the net force experienced by the ball with the +4a charge. (Use only or symbols. Do not include any parentheses around the letters or symbols.) (b) If g is 3.90 x 106 c and ris 40.0 cm, calculate the magnitude and direction of the net force acting on the ball with the +4g charge in case 1. (Define the positive direction as pointing to the right, so your answer should have a positive sign ifthe net force is directed right, and a negative sign if the net force is directed left.) x N Addit eBook Submit An ve Progre 637 PM GEO 4) Search all the things A 2/6/2017 416)Explanation / Answer
b)
In case 1,
-2*q and -q charge exert attractive force on +4*q. i.e towards +x axis.
so, net force on +4*q,
Fnet = k*4*q*2*q/r^2 + k*4*q*q/(2*r)^2
= 8*k*q^2/r^2 + k*q^2/r^2
= 9*k*q^2/r^2
= 9*9*10^9*(3.9*10^-6)^2/(0.4)^2
= 7.70 N
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