The membrane surrounding a living cell consists of an inner and
an outer wall that are separated by a small space. Assume that the
membrane acts like a parallel plate capacitor in which the
effective charge density on the inner and outer walls has a
magnitude of 7.1 10-6 C/m2. (a) What is the magnitude of the
electric field within the cell membrane? N/C (b) Find the magnitude
of the electric force that would be exerted on a potassium ion (K+;
charge = +e) placed inside the membrane. N