A 10 cm long thin glass rod uniformly charged to +10 nC and a 10cm long thin plastic rod uniformly charged to -10nC are placed sideby side 4 cm apart.
a. Find the electric field at distances 1.0 cm, 2.0 cm and 3.0cm from the glass rod along the line connecting the midpoints ofthe two rods. (Hint: treat the rods as a uniform line ofcharges.)
b. If the plastic rod is exchanged for a glass rod of the samesize uniformly charged to +10 nC, what is the new electric field at1.0 cm, 2.0 cm and 3.0 cm?
