Current Attempt in Progress An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.2 cm, and the electric field within the capacitor has a magnitude of 2.1 x 10 V/m. What is the kinetic energy of the electron just as it reaches the positive plate? Electric field Electron + + + + + + + +++ F KE positive = iCurrent Attempt in Progress The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.068 V exists across the membrane. The thickness of the membrane is 9.4 x 10-9 m. What is the magnitude of the electric field in the membrane? Number i Units eTextbook and Media