Consider a portion of a cell membrane that has a thickness of 7.50 nm and 2.0 um x 2.0 um in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 88.4 mV. The resistivity of the membrane material is 1.30 x 10' 0 . m. (a) Determine the amount of current that flows through this portion of the membrane. A (b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do not change. increase by a factor of 2 increase by a factor of 4 decrease by a factor of 8 O decrease by a factor of 2 O decrease by a factor of 4 Additional Materials Reading [-/1 Points] DETAILS OSCOLPHYS2016 20.3.WA.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 1.45% from its value at 20.0C. Over what temperature range can it be used? The temperature coefficient of resistivity for Nichrome is 0.4 x 10-3 (C)-1. lower limit .C upper limit .C