A) Two non-conducting infinite planes of uniform surface charge ?1 = 13.11 µC/m2 and ?2 = ?3.5 µC/m2 are parallel to each other and d = 0.129 m apart. What is the electric field between the planes? (Note: the field is positive if it is in the direction of x hat.)
B) What is the electric field outside the planes, at A?