Class Management Help Problem Set 3 Begin Date: 2/10/2018 1:00:00 PM -- Due Date
ID: 1874996 • Letter: C
Question
Class Management Help Problem Set 3 Begin Date: 2/10/2018 1:00:00 PM -- Due Date: 2/23/2018 1:00:00 PM End Date: 3/2/2018 1:00:00 PM (800) Problem 6: Charge q!--15 nC is located at the coordinate system origin. while charge q,--686 nC is located at (a, 0), where a 0.65 m. The point P has coordinates (a, b), where b 0.45 m. A third charge q3 7.5 nC will be placed later (a,b) q1 ©theexpertta.com 50% Part (a) Find the electric potential VP at point P in volts. Assume the potential is zero at infinity Grade Summary 0% 100% Potential sin() cosO cotanasin0 Submissions Attempts remaining:9 (1% per attempt) detailed view acoso atan acotan) sinh0 cosh tanh cotanh0 0 END egrees Radians DEL CLEAR Submit Hint I give up! Hints: 090 deduction per hint. Hints remaining: 2 Feedback: 0% deduction per feedback. 50% Part (b) How much work W in Joules, would you have to do to bring the third charge q3: from very far away to the pointP? All content 2018 ExpertExplanation / Answer
a) potential at point P,
VP = V1 + V2
= k*q1/r1 + k*q2/r2
= 9*10^9*-1.5*10^-9/sqrt(0.65^2 + 0.45^2) + 9*10^9*(-6.86*10^-9)/0.45
= -154.3 V
b) workdone to bring the third from far away,
Workdone = q3*(Vp - V_infinite)
= 7.5*10^-9*(-154.3 - 0)
= -1.16*10^-6 J