Physics with Calculus
dV=krdqdV = k\,r\,dq
dV=kdqr2\(\displaystyle\) dV=\(\frac{k\,dq}{r^2}\)
dV=EdqdV = E\,dq
dV=kdqr\(\displaystyle\) dV=\(\frac{k\,dq}{r}\)