Find the direction of the electric fieldwithin the cell membrane. a) into the ce

Question

Find the direction of the electric fieldwithin the cell membrane.
a) into the cell
b) out of the cell

Find the magnitude of the electric fieldwithin the cell membrane.
______________N/C

Calculate the potential difference betweenthe inner and outer walls of the membrane.
______________mV

Indicate which wall of the membrane has thehigher potential.
a) inner wall
b) outer wall


Thanks for you help.


BTW, this is problem 97 from chapter 20.
Find the magnitude of the electric fieldwithin the cell membrane.
______________N/C

Calculate the potential difference betweenthe inner and outer walls of the membrane.
______________mV

Indicate which wall of the membrane has thehigher potential.
a) inner wall
b) outer wall


Thanks for you help.


BTW, this is problem 97 from chapter 20.
Calculate the potential difference betweenthe inner and outer walls of the membrane.
______________mV

Indicate which wall of the membrane has thehigher potential.
a) inner wall
b) outer wall


Thanks for you help.


BTW, this is problem 97 from chapter 20.
Indicate which wall of the membrane has thehigher potential.
a) inner wall
b) outer wall


Thanks for you help.


BTW, this is problem 97 from chapter 20.

Explanation / Answer

Thickness of cell membrane d =8.9*10-9 m charge density = 6.4*10-4 C /m2 Dielectric constant of membrane k =5.5 a ) Magnitude of Electric field is E = / 0 k                                                       = 6.4 *10-4 C /m2 /8.85*10-12 * 5.5                                                        = 7.23*107 N /C As the inner surface of membrane is negativecharge then the electric field   is into the cell. b)   Potential difference between the walls ofthe membrane is                       V = E d                             =  7.23*107 N /C *8.9*10-9 m                               = 643 mV     The charge density outer of the wall has higher potential

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