1. The potential difference across a cell membrane is 71.0mV. If the membrane's thickness is 16.0 nm, what is the magnitude of the electric field in the membrane? Assume the field is uniform.
2. A point chargeq= 2.20 nC is initially at rest adjacent to the negative plate of a capacitor. The charge per unit area on the plates is 3.30 C/m²and the space between the plates is 5.20 mm. What is the kinetic energy of the point charge just before it hits the positive plate, assuming no other forces act on it?