Electrostatics

What unit is used to measure electric potential (voltage)?

A long cylindrical conductor carries a uniformly distributed free charge along its length; if $V(r)$ represents potential at a distance $r$ from its axis, how does $V(r)$ change outside the conductor?

What unit is used to measure electric potential?

What is the self-energy $U$ of a non-conducting solid sphere of radius $R$ with volume charge density $\rho$ distributed uniformly throughout its volume using energy density $u=\left(\frac{\varepsilon_0}{2}\right)E^2$?

For two parallel non-conducting sheets each uniformly charged but with opposite sign charges (+σ and −σ respectively), what would be true about any external effects outside these sheets if they were brought infinitely close together without touching?

In comparison to an isolated parallel plate capacitor with vacuum between its plates, how does inserting a dielectric material with permittivity ε affect its capacitive storage of electrical potential energy?

What does a positive test charge experience when placed in an area with zero electric field strength?

What happens to the electric potential difference across a capacitor when the separation between its plates is doubled while keeping the charge constant?

A nonconducting sphere carries a uniform volume charge density; what happens to the potential difference between its surface and a point halfway to its center as you move that interior point closer to the sphere's center?

When comparing an infinite sheet of positive charge with a positively charged ring, both producing an electric field in space above them, for which configuration does this field decay more rapidly with increasing distance from it?