Electric current — practice question

Determine the electric field strength in a region in which a proton accelerates at $2.00\,\text{m s}^{-2}$ because of the field.

• A$11.4\,\text{pV m}^{-1}$
• B$5.22\,\text{nV m}^{-1}$
• C$10.4\,\text{nV m}^{-1}$
• D$20.9\,\text{nV m}^{-1}$