In a region, potential is a function of x only, i$.$e$.$ potential does not change in the y$-$ or z$-$direction. Consider three equally spaced equipotential surfaces with V $=50$ V for x $=0\mathrm{.}0$ m$,$V$=100$ V for$$x$=1\mathrm{.}0$ m$,$V$=150$ V for$$x$=2\mathrm{.}0$ m$.$ Calculate the absolute value of the magnitude of electric field on the middle surface in the units of V$/$m$.$

Write your answer to the first decimal place,$$e$.$g$.26\mathrm{.}3$

Do not include units or any sign in your answer; just write the numerical value.$$