If you have the relationship : V=Vo x e^-t/CR
(V is equal to Vo multiplied by e to the power of -t/CR)
And you need to plot V on the y axis and 1/R on the x axis to get a graph with a straight line, what would be the gradient in terms of C?

By dividing you can find the answer

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Your answer is 120miles