Red blood cells can often be charged. Consider two red blood cells with the foll
ID: 1375764 • Letter: R
Question
Red blood cells can often be charged. Consider two red blood cells with the following charges:
?24.2 pC
and +49.0 pC.The red blood cells are 3.57 cm apart. (1 pC = 1 ? 10?12 C.)
(a) What is the magnitude of the force on each red blood cell?
N
Are the red blood cells attracted or repulsed by each other?
attractedrepulsed
(b) The red blood cells come into contact with each other and then are separated by 3.57 cm. What magnitude of force does each of the red blood cells now experience?
N
Are the red blood cells attracted or repulsed by each other?attractedrepulsed
Explanation / Answer
a)
F = k*q1q2/r^2 = 49*24.2*10^-24*9*10^9/(3.57*10^-2)^2
F = 8.374*10^-9 N
b)
q = (49-24.2)/2 = 12.4 pC
F = k*q^2/r^2 =(12.4*10^-12)^2*9*10^9/(3.57*10^-2)^2
F = 1.086*10^-9 N
red blood cells are repulsed
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