Consider a long (aka infinite) conducting wire, with a

Last updated: 7/10/2022

Consider a long (aka infinite) conducting wire, with a diameter of 1 mm. It is charged with a linear charge density of +8 nC/m. There also exists a point charge of 13 nC at a distance of 4cm above the wire. What is the electric field at point P, 8 cm below the wire? What is the maximum mass of a -15nC point charge such that it is suspended in place at point P? (Hint for second question, you are balancing the electric force and gravity.)