Question

2.0 Figure 2 below shows a triangular array of three point charges. Find the electric [5]

potential V of these source charges at the midpoint P of the base of the triangle.

Q2 = -2.0 x 10-6c

Q3 = +3.0 x 10-6c

Q1 = +1.0 x 10-6c

P

0.200 m 0.200 m

0.300 m

Answer 1

$r_1=r_2=0.2~m,~r_3=0.3~m,$

$U=k(\frac{q_1}{r_1}+\frac{q_2}{r_2}+\frac{q_3}{r_3})=45~\cdot ~10^3~V=45~kV.$