Question

Write down relationship between electric field and potential.

Answer 1

Since the potential $\phi =\frac W q$ , where $W$ is energy and $q$ is charge, the voltage $U=∆\phi=\frac A q$ , where $A$ is work, a work is equal to $A=q\times E \times ∆r$ , from this follows that

$E=\frac {∆\phi}{∆r}$ .