(1)The inner and outer surfaces of a cell membrane carry a negative and positive
ID: 2042176 • Letter: #
Question
(1)The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.090 V exists across the membrane. The thickness of the membrane is 8.00 X 10^-9 m. What is the magnitude of the electric field in the membrane?V/m=______________
(2)The work done by an electric force in moving a charge from point A to point B is 3.00 10-3 J. The electric potential difference between the two points is VA-VB = 190.0 V. What is the charge?
C=_____________
Explanation / Answer
1. 0.09 / 8e-9= E E = 1.125 e7 N /m 2. 3e-3 = 190 q q = 1.578e-5 C
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