Solve the each parts of following question:
Question: A proton is shot directly away from an infinite charged plane which has a uniform surface charge density of -6.07 x 10-6 C/m2. The proton's initial velocity is 2.48 x 106m/s.
Part A: How much charge is located within a 1.95 cm2 area of the infinite sheet?
Part B: How far does the proton travel before reaching its turning point?
I need help to find how much charge is located within a 1.95 cm2 area of the infinite sheet.