Two separate regions of space contain uniform electric fields. In Region 1, a series of parallel planar equipotential surfaces are separated by a uniform distance \(2d\), with a potential difference of \(\Delta V\) between adjacent surfaces. In Region 2, a series of parallel planar equipotential surfaces are separated by a uniform distance \(d\), with a potential difference of \(3\Delta V\) between adjacent surfaces. What is the ratio \(E_2 / E_1\) of the magnitude of the electric field in Region 2 to that in Region 1?