Electromagnetism

Question

Four loads of value q=41 nC occupy the positions shown in the square in the figure. The square has sides given by ℓ=1 m. The variable x represents the points along the diagonal (consider the origin of x at the beginning (base) of the vector, as shown in the figure). Calculate:(a) What is the potential, in volts, for point x0 = 1((2)^(1/2)/7)m.
(b) Find the electric field along the x direction, E(x), in volts per meter (V/m), for x0 = 1((2)^(1/2)/7)m.
(C) What is the work, in Joules (J), that was expended to form the configuration shown in the figure?

Answers to the book:
(a) 2976.01
(b) 8209.88
(c) 8.17