A red blood cell typically carries an excess charge of about −2.5× 10-12 C distributed uniformly over its surface. The cells, modeled as spheres, are approximately 7.5 μm in diameter and have a mass of 9.0× 10-14 kg. (a) How many excess electrons does a typical red blood cell carry? (b) What is the surface charge density σ on the red blood cell? Express your answer in C/m2 and in electrons/m2. σ = C/m2 = electrons/m2

A red blood cell typically carries an excess charge of about −2.5× 10-12 C distributed uniformly over its surface. The cells, modeled as spheres, are approximately 7.5 μm in diameter and have a mass of 9.0× 10-14 kg. (a) How many excess electrons does a typical red blood cell carry? (b) What is the surface charge density σ on the red blood cell? Express your answer in C/m2 and in electrons/m2. σ = C/m2 = electrons/m2

Similar questions

Problem 2: Space explorers discover an mA = 8.7 x 10¹7 kg asteroid that happens to have a positive charge of qA = 4400 C. They would like to place their ms = 3.3 x 105 kg spaceship in orbit around the asteroid. Interestingly, the solar wind has given their spaceship a charge of qs -1.2 C. What speed must their spaceship have to achieve a 7500-km- diameter circular orbit? qA, MA + 2 0.gs, Ms
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 13.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?
Two large, nonconducting plates are suspended 2.83 cm apart. Plate 1 has an area charge density of +92.3 µC/m², and plate 2 has an area charge density of +10.1 µC/m². Treat each plate as an infinite sheet. How much electrostatic energy UE is stored in 2.29 cm³ of the space in region A? UE = What volume V of the space in region B stores an equal amount of energy? V = J 3 cm³ Plate 1 Region A Region B Plate 2 Region C
Two test charges are located in the ?x–?y plane. If ?1=−4.70 nCq1=−4.70 nC and is located at ?1=0.00 m,x1=0.00 m, ?1=0.680 m,y1=0.680 m, and the second test charge has magnitude of ?2=3.00 nCq2=3.00 nC and is located at ?2=1.20 m,x2=1.20 m, ?2=0.550 m,y2=0.550 m, calculate the ?x and ?y components, ?xEx and ?y,Ey, of the electric field ?⃗ E→ in component form at the origin, (0,0). The Coulomb force constant is 1/(4??0)=8.99×109 N·m2/ C2.
An object has a charge of -2.00 pC on it. How many electrons would you have to add/remove to make the charge become -5.00 pC?
Two red blood cells each have a mass of 5.05 × 10-¹4 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. Once cell carries -2.60 pC of charge and the other -2.70 pC, and each cell can be modeled as a sphere 8.20 µm in diameter. What minimum relative speed u would the red blood cells need when very far away from each other to get close enough to just touch? Ignore viscous drag from the surrounding liquid. V = What is the magnitude of the maximum acceleration amax of each cell? Cmax = m/s m/s²
Two red blood cells each have a mass of 9.05 × 10-14 kg and carry a negative charge spread uniformly over their surfaces. The repulsion arising from the excess charge prevents the cells from clumping together. One cell carries -3.00 pC and the other -2.60 pC, and each cell can be modeled as a sphere 3.75 × 10-º m in radius. If the red blood cells start very far apart and move directly toward each other with the same speed, what initial speed would each need so that they get close enough to just barely touch? Assume that there is no viscous drag from any of the surrounding liquid. initial speed: m/s What is the maximum acceleration of the cells as they move toward each other and just barely touch? maximum acceleration: m/s?
Two chloride ions and two sodium ions are in water, the “effective charge” on the chloride ions (Cl−) is −2.00 × 10−21 C and that of the sodium ions (Na+) is +2.00 × 10−21 C. (The effective charge is a way to account for the partial shielding due to nearby water molecules.) Assume that all four ions are coplanar. where a = 0.280 nm, b = 0.760 nm, and c = 0.460 nm. What is the direction of electric force on the chloride ion in the lower right-hand corner in the diagram? Enter the angle in degrees where positive indicates above the negative x-axis and negative indicates below the positive x-axis. ° Prev
The ink drops have a mass mmm = 1.00×10−11 kg each and leave the nozzle and travel horizontally toward the paper at velocity v = 15.0 m/s. The drops pass through a charging unit that gives each drop a positive charge q by causing it to lose some electrons. The drops then pass between parallel deflecting plates of length D0D0D_0 = 2.15 cm, where there is a uniform vertical electric field with magnitude E = 7.70×104 N/C. 1) If a drop is to be deflected a distance d = 0.340 mmmm by the time it reaches the end of the deflection plate, what magnitude of charge q must be given to the drop? Assume that the density of the ink drop is 1000 kg/m3 , and ignore the effects of gravity.