Two point charges 5×10−8C and −3×10−8C are located 16 cm apart. At what point on the line joining these charges the electric potential will be zero?
Let the distance of the point from charge 5×10−8C be r.
Hence the distance of this point from the other charge is 16−r.
Since the potential at the point is zero,
k(5×10−8)r+k(−3×10−8)16−r=0
⟹r=10cm