Two charges 5 x 10^–8C and –3 x 10^–8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.

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The other possibility of point where total potential due to q₁ and q₂ are zero may be that point lies out side the segment joining q₁ and q₂


Let required point P lies x from  then 
                           
             
or                               
                            
                                

required point is 40 cm away from  q₁ and (40 – 16) = 24 cm from q₂.