A charge of +4µC is placed at one corner of an equilateral triangle and a charge of -2µC at another corner. The sides of the triangle are 1.5m long.
(i) What is the electric potential at the corner of the triangle without a charge?
(ii) What is the size of the electric field strength at the corner without a charge? Draw a sketch to explain your answer.
(iii) Calculate the potential difference which would have to be applied between the two parallel plates 3.0mm apart to cause the same electric field as that in (ii).