Two charges are placed along the x-axis (positive x to the right). Charge q1 = - 2 µC (microC) is placed to the left of q2 5.4 uC (microC) and they are separated a distance d = 40 cm. Point O is...

Extracted text: Two charges are placed along the x-axis (positive x to the right). Charge q1 = - 2 µC (microC) is placed to the left of q2 5.4 uC (microC) and they are separated a distance d = 40 cm. Point O is midway between the charges. a) Find the electric field (magnitude and direction) due to both charges at point O. b) Find the electric potential due to both charges at point O.