Answers

2015-12-22T19:22:31+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let, +q and –q are the charges along the line               
                                                                                                     
Q
Potential at a point, which is at a distance r from the center,

           1              q
 V = -- ------- X -------                                                                                                                       4 πε0          r     
                              1              q

So, here Vq    = ------- X ----------                                  
                             4 πε0    (a + r)
                             

             1              -q
         
V-q    = ------- X ----------
                         
           4 πε0         (r-a)
  

Now,  V = Vq + V-q        
                                      q            2a 
 
So,       Potential   = -------  X  ----------                          
                                  4 πε0      (a2-r2)
 
 

0