online assignment 5-1-1

online assignment 5-1-1 - MasteringPhysics: Assignment...

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MasteringPhysics: Assignment Print View file:///C:/Documents%20and%20Settings/lbr/Desktop/Ch6_files/assi. .. 1 of 13 10/12/2006 1:44 PM Physics 220 Assignment 6 Assignment is due at 11:59pm on Tuesday, October 17, 2006 Credit for problems submitted late will decrease to 0% over the course of 240 hour(s) after the deadline has passed. The wrong answer penalty is 1% per part. Multiple choice questions are penalized as described in the online help. There is no opened hint penalty or unopened hint bonus. You are allowed unlimited attempts per answer. Class 16 Capacitance: A Review Description: Multiple-choice questions on concept of capacitance. Use after Introduction to Capacitance. Some questions are repetitions of those in other problems. This fact may get some students frustrated. 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: , where is the capacitance in farads, is the charge stored on the plates in coulombs, and 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 and the distance between the plates, , by . Part A What property of objects is best measured by their capacitance? ANSWER: the ability to conduct electric current the ability to distort an external electrostatic field the ability to store charge Capacitance is a measure of the ability of a system of two conductors to store electric charge and energy. It is defined as . This ratio remains constant as long as the system retains its geometry and the amount of dielectric does not change. Capacitors are special devices designed to combine a large capacitance with a small size. However, any pair of conductors separated by a dielectric (or vacuum) has some capacitance. Even an isolated electrode has a small capacitance. That is, if a charge is placed on it, its potential with respect to ground would change, and the ratio is its capacitance . Part B Consider an air-filled charged capacitor. How can its capacitance be increased? Hint B.1 What does capacitance depend on? Capacitance depends on the inherent properties of the system of conductors, such as its geometry and the presence of dielectric, not on the charge placed on the conductors. Specifically, capacitance depends on the area of the conducting plates and the distance between the plates and is given by

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This note was uploaded on 07/01/2010 for the course PHYS 101213 taught by Professor Bratton during the Spring '10 term at CSU Chico.

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online assignment 5-1-1 - MasteringPhysics: Assignment...

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