Assume that a ball of charged particles has a uniformly distributednegative charge density except for a narrow radial tunnel throughits center, from t

Lennie Carroll 2021-05-20 Answered
Assume that a ball of charged particles has a uniformly distributednegative charge density except for a narrow radial tunnel throughits center, from the surface on one side to the surface on the opposite side. Also assume that we can position a proton any where along the tunnel or outside the ball. Let FR be the magnitude of the electrostatic force on the proton when it islocated at the ball's surface, at radius R. As a multiple ofR, how far from the surface is there a point where the forcemagnitude is 0.44FR if we move the proton(a) away from the ball and (b) into the tunnel?
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Expert Answer

yagombyeR
Answered 2021-05-22 Author has 92 answers
Jeffrey Jordon
Answered 2021-10-14 Author has 2027 answers

(a) The flux is still 750Nm2/C2 , since it depends only on the amount of charge enclosed. 

(b) We use  ϕ=qϵ0​ to obtain the charge q :

q=ϵ0ϕ=(8.85×1012C2/N m2)(750 N.m2/C2)=

6.64×109C

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