A
- Akash Anand Good WorkUpvote·0· Reply ·2013-05-30 23:33:26
A
Since the ist charge>the second charge
the possibility of potential being zero is between the two charges...and to the right of charge Q...the two points we will find will be (a,0) and (9a,0)...these points are the diameter of the circle....hence radius=4a and centre (5a,0)