Recall that

The car starts from rest, so
, and we get

There's no possible way to think about the validity of that equation until we know what the variables v, R, and g represent.
All ions are atoms with a charge
Answer:
70509.8039216 N/C
Explanation:
k = Coulomb constant = 
q = Charge = 2.00 µC
l = Length of filament = 5.1 m
r = Radius of cylinder = 10 cm

Electric field is given by

The electric field at the surface of the cylinder is 70509.8039216 N/C