A typical cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outside surface, thus making the cell wall a capacitor. Part A What is the capacitance of a 50-um-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0? Because the 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. Express your answer to two significant figures and include the appropriate units. µA Value Units

A typical cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outside surface, thus making the cell wall a capacitor. Part A What is the capacitance of a 50-um-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0? Because the 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. Express your answer to two significant figures and include the appropriate units. µA Value Units

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Part A An uncharged capacitor is connected to the terminals of a 4.0 V battery, and 9.0 µC flows to the positive plate. The 4.0 V battery is then disconnected and replaced with a 5.0 V battery, with the positive and negative terminals connected in the same manner as before. How much additional charge flows to the positive plate? Express your answer in microcoulombs. ν ΑΣφ Submit Previous Answers Request Answer
Part A To what potential should you charge a 0.700 μF capacitor to store 1.30 J of energy? Express your answer with the appropriate units. HÅ Value Submit Units Request Answer wwww ?
A Moving to another question will save this response. Question 5 Calculate the potential (in Volt) at distance r=0.62cm from the center of a conducting sphere of radius R=1cm and a total charge Q=1nC. R A Moving to another question will save this response.
A2.85 μF capacitor is charged to 460 V and a 3.80 μF capacitor is charged to 535 V Part A These capacitors are then disconnected from their batteries, and the positive plates are now connected to each other and the negative plates are connected to each other. What will be the potential difference across each capacitor? Enter your answers numerically separated by a comma. V₁, V₂ = Submit Part B Q1, Q2 = ΠΙ ΑΣΦ What will be the charge on each capacitor? Enter your answers numerically separated by a comma. Submit Request Answer IVE ΑΣΦ Request Answer ? ? V mC
Y Part A The two plates of a capacitor hold +2500 uC and -2500 µC of charge, respectively, when the potential difference is 970 V What is the capacitance? Express your answer using three significant figures and include the appropriate units. C = Talue: Units
ew ConstanlS A 10.0 nC charge is at x = Ocm and a -1.0 nC charge is at x = 3 cm . Part A At what point or points on the x-axis is the electric potential zero? Express your answer using two significant figures. If there is more than one answer, give each answer separated by a comma. ΑΣφ cm
A 3.00-cm-diameter parallel-plate capacitor with a spacing of 0.900 mm is charged to 200 V. Part A What is the total energy stored in the electric field? Express your answer with the appropriate units. View Available Hint(s) HA Uc= Submit Part B Ug = Value Submit What is the energy density? Express your answer with the appropriate units. ► View Available Hint(s) μÀ H Value Units B Units ? ?
Two 1.70-cm-diameter disks spaced 2.00 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.80×105 V/m. You may want to review (Pages 699-702). For help with math skills, you may want to review: Area Calculations for a Circle Mathematical Expressions Involving Squares Part A What is the voltage across the capacitor? Express your answer to two significant figures and include the appropriate units. V = Submit Part B V = HÅ Value Request Answer Submit An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.40x107 m/s. What was the electron's speed as it left the negative plate? Express your answer to two significant figures and include the appropriate units. μA Value Units Request Answer Units By ? ?
A spherical capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has a radius of ra = 12.4 cm, and the outer sphere has a radius of 7b = 14.9 cm. A potential difference of 120 V is applied to the capacitor. Part A What is the capacitance of the capacitor? Use €0 = 8.85×10-12 F/m for the permittivity of free space. ▸ View Available Hint(s) ΕΧΕΙ ΑΣΦ C = c. ? b x x |X| x.10n Submit Previous Answers Request Answer ☑ F
Part A A dust particle with mass of 5.9x10-2 g and a charge of 1.6x10-6 C is in a region of space where the potential is given by V(z) = (1.2V/m²)a? – (3.4V/m)a If the particle starts at 1.6 m, what is the initial acceleration of the charge? Express your answer using two significant figures. nν ΑΣφ -- |7.7. 10-4 m/s? Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining
P 1: An air-filled parallel plate capacitor of gap d is connected to a battery until fully charged. It is then disconnected from the battery. The original capacitance was Co, the charge was Qo and potential difference between the plates was Vo. The gap between the charged capacitor plates is doubled while the battery stays disconnected. What are the new values of the following quantities. Give your answers in terms of Co, Qo and Vo. Capacitance: Charge: Q? +Qo Co V? 2d C? d. Vo Potential difference: Before After