question_answer

Two unlike charges of magnitude \[q\] are separated by a distance \[2d\]. The potential at a point midway between them is                                                                            [JIPMER 1999]

A)            Zero

B)                                      \[\frac{1}{4\pi {{\varepsilon }_{0}}}\]

C)            \[\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{q}{d}\]     

D)            \[\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{2q}{{{d}^{2}}}\]

Correct Answer: A

Solution :

                     Potential at mid point \[O,\,\,\,V=\frac{kq}{d}+\frac{k(-q)}{d}=0\]