A charged spherical conductor has a radius $r$ - AQA - A-Level Physics - Question 21 - 2018 - Paper 2

The potential $V$ of a charged conductor can be calculated using the relationship between electric field $E$ and potential. The potential at the surface of a charged spherical conductor is given by the formula:

$V = E imes r$

Where:

• $E$ is the electric field strength at the surface
• $r$ is the radius of the conductor

Thus, the potential of the spherical conductor is equal to $rE$, corresponding to option A.