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This is the question:

The membrane that surrounds a certain type of living cell has a surface area of 5.0 mm2 and a thickness of 10 nm. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.0. If the potential inside the membrane is -60.0 mV with respect to the outside how much charge resides on the outer surface? If the charge is due to monovalent ions, how many such ions are present on the outer surface?

Epsilon0 = 8.85 X 10-12 C2/(N.m2)

e = 1.6 X 10-19 C

This is my working:

V=Q/Ak(Epsilon0)d

-60X10^-3=Q/(5.0X10^-6)X5.0X(8.85X10^-12)X(10X10^-9)

Q=-1.3275X10^-25C

Charge of 1 electron=1.6X10^-19C

No of ions = 1.3275X10-25/1.6X10^-19=8.296X10^-7

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# Calculation involving Parallel Plate Capacitor

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