) A potential difference of 105 mV exists between the inner and outer surface of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion an (Na+) from the interior of the cell?
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Q.) A potential difference of 105 mV exists between the inner and outer surface of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion an (Na+) from the interior of the cell?
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- A very long wire carries a uniform linear charge density λ. Using a voltmeter to measure potential difference, you find that when one probe of the meter is placed 2.30 cm from the wire and the other probe is 1.20 cm farther from the wire, the meter reads 590 V. What is |λ|?A nerve cell is shaped like a cylinder. The membrane wall of the cylinder has a +0.07-V potential difference from the inside to the outside of the wall. To help maintain this potential difference, sodium ions are pumped from inside the cell to the outside. For a typical cell, 10^9 ions are pumped each second. a. Determine the change in chemical energy each second required to produce this increase in electric potential energy. b. If there are roughly 7×10^11 of these cells in the body, how much chemical energy is used in pumping sodium ions each second? c. Estimate the fraction of a person's metabolic rate used to pump these ions. Assume the metabolic rate to be 100 W.Ex. 79: Two condensers having capacitors 12 μF and 6 µF are connected in parallel. A battery of 200 V is connected across the combination. Calculate the resultant capacity and charge on each condenser. If they are connected in series, calculate the charge on each condenser and resultant capacity.
- A proton with an initial speed of 850,000 m/s is brought to rest by an electric field. ▾ Part A Did the proton move into a region of higher potential or lower potential? O Because the proton is a positive charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential. O Because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential. O Because the proton is a negative charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential. Because the proton is a positive charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential. Submit ✓ Correct Here we learn how to determine the distribution of the electric potential based on the movement of a charged particle. Part B Previous Answers What was the potential difference…I Review A typical cell has a membrane potential of -70 mV, meaning that the potential inside the cell is 70 mV less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. This effectively makes the cell wall a charged capacitor. Because a cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel- plate capacitor. Part A How much energy is stored in the electric field of a 50-um-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0? Express your answer with the appropriate units. HẢ ? -17 Uc = 3,905 • 10 J Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remainingA potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell?_______________________J
- How much work does the battery do in moving 5 μ C from its low terminal to its high terminal? Answer in μJ. Diagram is attached.For a system of 4 capacitors shown in the figure below: Determine the following:A. The equivalent capacitance of the systemB. The charge on each capacitorC. The potential difference across each capacitorD. The stored energy in each capacitorA potential difference of 98 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell? J
- I have a physics question as follows: A parallel-plate capacitor in air has a plate separation of 1.56 cm and a plate area of 25.0 cm2. The plates are charged to a potential difference of 225 V and disconnected from the source. The capacitor is then immersed in distilled water. Assume the liquid is an insulator. (a) Determine the charge on the plates before and after immersion. (b) Determine the capacitance and potential difference after immersion.(c) Determine the change in energy of the capacitor.At locations A and B, the electric potential has the values VA = 1.59 V and VR = 5.87 V, respectively. A proton released from rest at one of these locations passes through the other location. From which location was the proton released? A В What is its speed when it passes through the other location? speed: m/s Repeat the same question, but this time for an electron. From which location was the electron released? A B What is its speed when it passes through the other location? speed: m/s4.0 µF 7.0 μΕ b 5.0 μF 6.0 μF ab Which of the followings is the total charge stored in the equivalent capacitance between points a and b in the combination of capacitors shown above if v = 12V?