A uniform electric field exists in the region between two oppositely charged parallel plates 1.62 cm apart. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval 1.55×10-6 s. Find the magnitude of the electric field. Use 1.60×10-19 C for the magnitude of the charge on an electron and 1.67×10-27 Kg for the mass of a proton.