Two particles with a net charge of 3.50~\text{nC}3.50 nC are fixed in the vertices of an equilateral triangle with side

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Two particles with a net charge
of 3.50~\text{nC}3.50 nC are fixed in the vertices
of an equilateral triangle with side
length 0.120~\text{m}0.120 m. A third particle, carrying
a net charge of -7.00~\text{nC}−7.00 nC and is free
to move, is initially placed at the third vertex.
a. What is the electric potential energy, in Joules, of the
third particle due to the first two particles? [Write your
answer in decimal form and indicate
the correct sign.]
b. What is the work done, in Joules, by the
electric field on the third particle if it is displaced from its
initial position, the vertex of the triangle, to a point in the
middle of the first two particles? [Write your answer
in decimal form and indicate
the correct sign.]
Cornered Two particles with a net charge of 3.50 nC are fixed in the vertices of an equilateral triangle with side length 0.120 m. A third particle, carrying a net charge of -7.00 nC and is free to move, is initially placed at the third vertex.