6. Four point-like charges are placed as shown in the figure, a = 18.0 cm. Find the electric potential energy of the entire system of charges. Let q₁ = +3.20 μC, q2 = -2.20 μC, q3 = +4.50 μC, and q4 = -8.30 μC. ssf60 ssf60 s a 60 ssf60 ssf60 ssf60 ssf60 ssf60 ssª ssf60 ssf60 ssf60f60 sf60 ssfor 92 a sf60 ssf60 ssf60 ssf60 ssf60 f60 ssfoss 20 ssfossf50 ssf60 s 160 ssf60 ssf60 ssf60 ssf60 s 50 ssf60 ssf

B5

Question 2: #72    a.  What is the electric potential at point A in Figure below? b. What is the potential energy of a proton at point A?

+Q +Q ves Bombes K +Q Q: +Q ta -a O a +29 A positive point charge +Q is located at x = -a. What is the electric potential energy of the system after an external agent bring in a second equal positive charge +Q from infinity to x = +a? (b) With the two equal point charges at x = -a and x = +a, what is the total electric potential energy of the system when an external agent brings in a third charge -Q from infinity to the origin? (c) By how much does the electric potential energy change when the charge -Q is moved from the origin to the point x = +2a along the semicircular path shown? Hint: how is the electric potential energy related to the electric potential?