A charge of $6.75 \mathrm{\mu C}$ in an electric field is acted upon by a force of 2.5 N. The potential gradient at this point is

• A

  $3.71\times {10}^{10}\text{ volt }/\mathrm{m}$

• B

  $3.71\times {10}^5\text{ volt }/\mathrm{m}$

• C

  $3\cdot 71\times {10}^{15}\text{ volt }/\mathrm{m}$

• D

  $3\cdot 71\times {10}^{12}\text{ volt }/\mathrm{m}$