1. The problem statement, all variables and given/known data Two point charges of unknown magnitude and sign are places at some distance apart. The electric field is zero at a point not between them , but on the line joining the. Write 2 essential conditions for this to happen. 2. Relevant equations E = q1*q2/(4 * pi * epsilon0 * r2) 3. The attempt at a solution Since the net field is zero at a point outside the line joining the 2 charges , they should be oppositely charged. So, condition one: The charges should be oppositely charged . What would be the second condition? Any help would be highly appreciated. Thank You.