Consider the following scenario using this simulation: the magnet is moved about $1\mathrm{.}3$ cm closer to the coils in a time of $1\mathrm{.}0$ s $,$ at a $-$steady speed. The galvanometer deflects to give a reading of $4\mathrm{.}0$ V $,$ and the coil has a total of $10$ turns, each of diameter $2\mathrm{.}4$ cm $.$ Determine the value of the magnetic field gradient, $\frac{B}{}x($in $\frac{T}{m})$ for this bar magnetic, assuming that it is uniform. Answer should have two significant figures.