How much work is needed to assemble an atomic nucleus containing three protons (such as li) if we model it as an equilateral triangle of side 2.00×10−15m2.00×10−15m with a proton at each vertex? assume the protons started from very far away.

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)