# physics

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The voltage across a membrane forming a cell wall is 80.0 mV and the membrane is 8.80 nm thick. What is the electric field strength? (The value is surprisingly large, but correct. Membranes are discussed in Section 19.7* of the textbook.) You may assume a uniform E-field.

• physics -

E = (deltaV)/(thickness)
= 80*10^-3/8.8*10^-9 (V/m)
= 9.1*10^6 V/m

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