I Review | ConstantsA parallel-plate vacuum capacitor has 8.02 J of energy storedin it. The separation between the plates is 2.70 mmРart AIf the separation is decreased to 1.40 mm, what is the energy now stored if the capacitor was disconnected from the potential source before theseparation of the plates was changed?Express your answer in joules.ο ΑΣφU =JSubmitRequest AnswerPart BIf the separation is decreased to 1.40 mm, what is the energy now stored if the capacitor remained connected to the potential source while theseparation of the plates was changed?Express your answer in joules.9:13 PM0 目4/29/2021Type here to search25hpprt scho l144back&%2480625%23

The capacitance of the capacitor in terms of the separation between the plates is, C=ε∘Ad where ε∘…

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Part A A parallel-plate vacuum capacitor has 6.18 J of energy stored in it. The separation between the plates is 3.90 mm . If the separation is decreased to 1.40 mm , what is the energy now stored if the capacitor was disconnected from the potential source before the separation of the plates was changed? U = J Submit Request Answer Part B What is the energy now stored if the capacitor remained connected to the potential source while the separation of the plates was changed? V AEO ? U = J
Constants A very long insulating cylinder of charge of radius 3.00 cm carries a uniform linear density of 17.0 nC/m Part A If you put one probe of a voltmeter at the surface, how far from the surface must the other probe be placed so that the voltmeter reads 195 V? Express your answer in centimeters. ΑΣφ cm
▾ Part C What is the electric potential at point A? Express your answer numerically in volts. View Available Hint(s) VA = [5] ΑΣΦΑΛΟ 15. t BWA 2. ? V
Part A The work done by an external force to move a -5.50 µC charge from point A to point B is 1.90x10-3 J If the charge was started from rest and had 4.68x10-4 Jof kinetic energy when it reached point B, what must be the potential difference between A and B? Express your answer with the appropriate units. µA VB - VA = Value Units Submit Request Answer Provide Feedback Next >
Part A 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. How much energy 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 to two significant figures and include the appropriate units. HA ? Uc = Value Units Submit Request Answer < Return to Assignment Provide Feedback
I Review | Constants | Periodi Part B Consider an initial system of three charges shown in (Figure 1). An object with charge q4 = + 8.0 × 10¬8 C will be moved to position C from infinity (not shown in the figure). q1 = q2 = q3 = +10.0 × 10¬8 C. Determine the final electric potential energy of the system consisting of all four charges, with q4 at position C. Express your answer with the appropriate units, to two significant figures. µA ? - 3 Uaf = 2.1 • 10 J Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part C Figure 1 of 1 Determine the work done on the system by moving the charge q4 from infinity to point C. Express your answer with the appropriate units, to two significant figures. HA ? 20.0 cm W = Value Units 92 +-20.0 cm C 20.0 cm Submit Request Answer Part D 93
II Review | Constants | Periodic Table The dielectric in a capacitor serves two purposes. It increases the capacitance, compared to an otherwise identical capacitor with an air gap, and it increases the maximum potential difference the capacitor can support. If the electric field in a material is sufficiently strong, the material will suddenly become able to conduct, creating a spark. The critical field strength, at which breakdown occurs, is 3.0 MV/m for air, but 60 MV/m for Teflon. Part A A parallel-plate capacitor consists of two square plates 11 cm on a side, spaced 0.55 mm apart with only air between them. What is the maximum energy that can be stored by the capacitor? Express your answer in joules. ν ΑΣφ ? x" х-10п U air = J Submit Previous Answers Request Answer Part B What is the maximum energy that can be stored if the plates are separated by a 0.55-mm-thick Teflon sheet? Express your answer in joules. Nνα ΑΣφ U Teflon = J Submit Request Answer
For the system of capacitors shown in (Figure 1), a potential difference of 25.0 V is maintained across ab. Part A For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Capacitors in series and in parallel. What is the equivalent capacitance of this system between a and b? Express your answer in nanofarads. C = nF Submit Request Answer Part B How much charge is stored by this system? Express your answer in nanocoulombs. ? Q = nC Submit Request Answer Part C How much charge does the 6.50 nF capacitor store? Figure 1 of 1 Express your answer in nanocoulombs. 7.5 nF ? 18.0 nF 30.0 nF 10.0 nF nC 6.5 nF Submit Request Answer
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Can you help with subparts 3a and 3b A clock battery wears out after moving 9600 C of charge through the clock at a rate of 0.540 mA. 3a. How long did the clock run? 3b. How many electrons per second flowed? This is not and will not be graded
Part A An isolated 4.40 µF parallel-plate capacitor has 4.20 mC of charge. An external force changes the distance between the electrodes until the How much work is done by the external force? capacitance is 2.40 µF. Express your answer with the appropriate units. HA W = Value J %D Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Return to Assignment Provide Feedback
Capacitors C₁ = 10 μF and C₂ = 20 μF are each charged to 22 V, then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C₁ connected to the negative plate of C2 and vice versa. Part A Afterward, what is the charge on each capacitor? Express your answers in microcoulombs separated by a comma. ► View Available Hint(s) VE ΑΣΦ Q1, Q2 = Submit X Incorrect; Try Again; 14 attempts remaining Part B Previous Answers What is the potential difference across each capacitor? Express your answers in volts separated by a comma. ► View Available Hint(s) 17 ΑΣΦ AV₁, AV₂ = Submit Previous Answers X Incorrect; Try Again; 14 attempts remaining w μC V