Two rods A and B of lengths L and

L$/2,$

respectively, are oriented vertically and are parallel to each other. The center of rod B lies on the perpendicular bisector of rod A$,$ and the centers are a distance

d $=$ L$/8$

apart, as shown in the figure. Point P is the midpoint between the centers of rods A and B$,$ also lying on the perpendicular bisector. Here,

L $=4\mathrm{.}50$ m

and the charge on rod A is $30\mathrm{.}0$C$.$ If the net electric potential at point P is zero, what is the charge $($magnitude and sign$)$ on rod B$?$ Note that the diagram is not to scale.

magnitude

Incorrect: Your answer is incorrect.

 

 Consider a small element dy of rod A to find the potential at P due to A$.$ How should the values of the two potentials be related for the net potential to be zero at the location P$?$