Solve the following problems. Show your solution. Use GRESA method in expressing the solution. 1. Two charges of 1=+ 3.0 and 2= 7.0 are separated by a distance of 50 cm. What is the electric field strength at a point that is 20cm from 1 and 30cm from 2? The point lies between 1 and 2. 2. Two charges of 1=+ 12.0 and 2= 12.0 are 0.100 m apart (such pairs of point charges with equal magnitude and opposite sign are called electric dipoles.). Calculate the electric field caused by 1. 3.Two charges, of 1=+ 3.50 and 2= 4.50 are 0.400 m apart. Where along the line joining them will net electric field be zero? Note: = 0 and 1 and 2 are opposite. 4. Four point charges are positioned as such: A(0,1), B(2,1), C(0,0), D(2,0). Charge A = -3 microcoulombs, Charge B =3 microcoulombs, C = 2microcoulombs, and D =-2 microcoulombs. What is the net electric field experienced at the origin.