While discussing electronic gasoline injection systems, Technician A states that most multiport EFI systems use two injectors for each engine cylinder. Technician B says such a system uses only one injector per engine cylinder. Who is right?

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)