c) A 100 mV potential exists across a 5 nm thick bilayer membrane. The dielectric constant of the membrane is 7. What is the electric field strength inside the membrane? What is the effective charge per unit area on the membrane?
Homework Answers
Electric field E = Eo/K
so
Eo = V/d
Eo = 0.1/5e-9
Eo = 2 e7 V/m
so
Enew = 2 e7 /7
Enew = 2.85 *10^6 V/m
--------------
also as E = Q/eoA
Q/A = Eeo
Q/A = 2.85 e 6 * 8.85 e-12
Q/A = 2.52 e-5 C/m^2
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