• Part A A parallel-plate capacitor is constructed from two 15 cm x 15 cm electrodes spaced 1.5 mm apart. The capacitor plates are charged to + 20 nC, then disconnected from the battery. How much energy is stored in the capacitor? Express your answer using two significant figures. U = Value Units Submit Reguest Answer • Part B Insulating handles are used to pull the capacitor plates apart until the spacing is 2.8 mm. Now how much energy is stored in the capacitor? Express your answer using two significant figures. ? Uz = Value Units Submit Request Answer • Part C Energy must be conserved. How do you account for the difference between A and B? O Work was done to pull the plates apart. O The electric field supplied addtional energy. O Kinetic energy of the charges was transformed into potential energy. O The battery supplied additional energy Submit Resuest Answer

• Part A A parallel-plate capacitor is constructed from two 15 cm x 15 cm electrodes spaced 1.5 mm apart. The capacitor plates are charged to + 20 nC, then disconnected from the battery. How much energy is stored in the capacitor? Express your answer using two significant figures. U = Value Units Submit Reguest Answer • Part B Insulating handles are used to pull the capacitor plates apart until the spacing is 2.8 mm. Now how much energy is stored in the capacitor? Express your answer using two significant figures. ? Uz = Value Units Submit Request Answer • Part C Energy must be conserved. How do you account for the difference between A and B? O Work was done to pull the plates apart. O The electric field supplied addtional energy. O Kinetic energy of the charges was transformed into potential energy. O The battery supplied additional energy Submit Resuest Answer

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter8: Capacitance

Section: Chapter Questions

Problem 62P: When a 360-nF air capacitor is connected to a power supply, the energy stored in the capacitor is...

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When a 360-nF air capacitor is connected to a power supply, the energy stored in the capacitor is 18.5J . While the capacitor is connected to the power supply, a slab of dielectric is insetted that completely fills die space between the plates. This increases the stored energy by 23.2J . (a) What is the potential difference between the capacitor plates? (b) What is die dielectric constant of the slab?
Two parallel conducting plates, each of cross-sectional area 400 cm2, are 2.0 cm apart and uncharged. If 1.01012 electrons are transferred from one plate to the other, (a) what is the potential difference between the plates? (b) What is the potential difference between the positive plate and a point 1.25 cm from it that is between the plates?
A parallel-plate capacitor has capacitance Co 8.50 pF when there is air between the plates. The separation between the plates is 1.70 mm %3D Part A What is the maomum magnitade of charge that can be placed on each plate d the electric feld in the region between the plates is not to exceed 3 00x10 V/m? Express your answer with the appropriate units. Value Units Submit Part B Adelectac with K330 is inserted between the plates of the capacilor, completely ting the volue betwoen the plates Now what s the maxemum magnitude of charoe on each plate il he electic fekd between the platos not to exceed 3.00 10 V/m? Express your answer with the appropriate units Q Value Units Submit Reguest Anser
QUESTION 1 What is the capacitance of a parallel plate capacitor in vacuum? Sol. The basic definition for capacitance is: C = Since the electric potential can also be written as V = Ed Where, E is the electric field contribution of the parallel plate (two plane charge): = 0/ E0 Sigma is the surface charge density given by: O= By, substitution, we get the capacitance of the parallel plate to be: C = E0*
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A parallel plate capacitor in air is constructed with two 32 cm x 32 cm square conductors separated by 4 mm. a) Determine the value of the capacitance of this parallel plate capacitor. b) This capacitor is placed across a 22 V battery and allowed to fully charge. What is the value of this charge? To continue, please enter your answer in b) in units of nC. Round your answer to 1 decimal place.
Item 10 Suppose two parallel-plate capacitors have the same charge Q, but the area of capacitor 1 is A and the area of capacitor 2 is 2.A. Part A If the spacing between the plates, d, is the same in both capacitors, and the voltage across capacitor 1 is V, what is the voltage across capacitor 2? ► View Available Hint(s) O Submit V/2 V 2V 4V Part B O If the spacing between the plates in capacitor 1 is d, what should the spacing between the plates in capacitor 2 be to make the capacitance of the two capacitors equal? ► View Available Hint(s) OOO d/2 O d 2d 4d 10 of 15 Submit Revie
Item 8 Learning Goal: To review the meaning of capacitance and ways of changing the capacitance of a parallel-plate capacitor. Capacitance is one of the central concepts in electrostatics. Understanding its meaning and the difference between its definition and the ways of calculating capacitance can be challenging at first. This tutorial is meant to help you become more comfortable with capacitance. Recall the fundamental formula for capacitance: C = Q/AVC, where C is the capacitance in farads, Q is the charge stored on the plates in coulombs, and AVC is the potential difference (or voltage) between the plates. In the following problems it may help to keep in mind that the voltage is related to the strength of the electric field E and the distance between the plates, d, by AVc = Ed. Part A What property of objects is best measured by their capacitance? the ability to conduct electric current the ability to distort an external electrostatic field the ability to store charge Submit Part…
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1. You have five 10.0 F capacitors. Show all the possible connections for the five capacitors to produce a total capacitance of 50.0 F. 2. Suppose the space between the plates of the capacitor in Sample Problem 2.6 item number 2 is filled with equal thicknesses of the same dielectrics but arranged as shown. What is its capacitance? 3. The capacitors in Sample Problem 2.6 item number 3 are connected in parallel instead of being in series. The combination is connected to a 100 V line. Find the (a) total capacitance, (b) charge stored in each capacitor, and (c) potential difference across each capacitor.