(1) Two charges A and B are fixed in place, at different distances from a certai

Question

(1) Two charges A and B are fixed in place, at different distances from a certain spot. At this spot the potentials due to the two charges are equal. Charge A is 0.24 m from the spot, while charge B is 0.36 m from it. Find the ratio qB / qA of the charges.
qB / qA = ______________

(2)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=______________

Explanation / Answer

kqA / rA = kqB / rB Use that to solve for the charge ratio of B over A. qB / qA = rB / rA = 036 m / 24 m = 1.5

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