1. A charge of 6 JC is 10 cm to the right of a -4-UC charge. Please find the resultant force on a 2-nC charge placed 4 cm to the right of the 6-pC charge. (8. 0) 2. Two point charges of -4 and -6 pC are 10 cm apart in air. Find the electric field midway between the two charges. (8. 0) 3. please draw a diagram of the electic field line of the positive charge and the equipotential surface (dotted line) of 2 V, 4 V and 6 V ( relative positon is ok). (8. 0)