Two point charges, q=40.0 nCq=40.0 nC and q=−40.0 nC, q=−40.0 nC, are in vacuum and located on the x-x- axis at −31.0 cm−31.0 cm and 31.0 cm,31.0 cm, respectively. Choosing the normal to the plane in the positive x-x- direction, calculate the total electric flux ΦΦ through the yz-yz- plane. Use 0=8.85×10−12 C2/(N·m2).

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . 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 of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate