Solve each part of given question:
Question: An electric field of 12.2 N/C directed due north is superposed on an existing electric field of 17.5 N/C directed due east.
Part A: What is the magnitude of the resultant field?
Part B: What is the direction of the resultant field as measured from the positive x-axis (East)?
Please provide clear step by step solution with notes on concepts and equations being used.