A charge of 3nC is at the point x=0,y=2 m and a charge of −1nC is at the point x=0,y=−2m. Fiind the electric field E (magnitude and direction) and the electric potential V at the oint x=0,y=−1m. 3. A potential distribution is given by V=5/(x 3 +y+z 3 ) volts. a. What is the vector expression for E ? b. What is the vector value of E at (0,0,4) and (5,4,3) ?