Two charges,q1 = +10 nC and q2 = -30 nC are 20 cm apart.Where (other than infinity) can a proton be placed so as to experience no net force? 
A) left of charge q1
B) on the line joining q1 and q2
C) right of charge q2
D) at a point P on the right bisector of the line joining the two charges
Correct Answer:
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