physics 2 Questions Answer in Joules (J)

q₂ = -1.4 C

q₁ = 2.2 C

d₁ = 7.4 cm

q₃ and q₄ which each have a magnitude of -0.7 C

a = 1.8 cm

What is the potential energy of the system composed of the three charges q1, q3, and q4, when q1 is at point R? Define the potential energy to be zero at infinity. The charge q4 is now replaced by charge q5 which has the same magnitude, but opposite sign from q4 (i.e., q5 = 0.7 pC). What is the new value for the potential energy of the system