Two +60-μC Point Charges Are Placed at the Corners of the the Base

Essay

Two +6.0-μC point charges are placed at the corners of the base of an equilateral triangle, as shown in the figure. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²) At the vertex, P, of the triangle
(a) what is the electric potential (relative to infinity) due to these charges?
(b) what is the magnitude of the electric field due to these charges?