# ch27 - Lecture 5 Electric Field Reading Quiz ° What is The...

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Unformatted text preview: Lecture 5 Electric Field Reading Quiz ° What is The SI unit of charge? ° What is The SI unit of charge? - Coulomb (C) - A charge alters The Space around it. What is This alteration of space called? - A charge alters The Space around it. What is this alteration of space called? - Electric Field If a negatively charged rod is held near a neutral metal ball, the ball is attracted to the rod. This happens a) Because of magnetic effects b) Because the ball tries to pull rod's electrons over to it c) Because the rod polarizes the metal d) Because the rod and the ball have opposite charges If a negatively charged rod is held near a neutral metal ball, the ball is attracted to the rod. This happens a) Because of magnetic effects b) Because the ball tries to pull rod's electrons over to it c) Because the rod polarizes the metal d) Because the rod and the ball have opposite charges The electric field of a charge is defined by The force on a) An electron b) A proton c) A source charge d) A test charge The electric field of a charge is defined by The force on a) An electron b) A proton c) A source charge d) A test charge 11 ° What device provides a practical way To produce a uniform electric field? - What device provides a practical way To produce a uniform electric field? - Parallel pla’re capacitor 1: ° For charged particles what is The quantity q/m called? ° For charged particles what is The quantity q/ m called? - Charge-fo-mass ra’rio Which of these charge distributions did not have its electric field determined in chapter 27? a) A line of charge b) A ring of charge c) A plane of charge d) A parallel-plate capacitor e) A sphere of charge f) None of the above - they were all determined 1! Which of these charge distributions did not have its electric field determined in chapter 27? a) A line of charge b) A ring of charge c) A plane of charge d) A parallel-plate capacitor e) A sphere of charge f) None of the above - they were all determined 11 The worked examples of charged-particle motion are relevant to a) A transistor b) Magnetic resonance imaging (MRI) c) Holography d) A cathode ray tube e) Cosmic rays 1‘) Lasers g) All of the above The worked examples of charged-particle motion are relevant to a) A transistor b) Magnetic resonance imaging (MRI) c) Holography d) A cathode ray tube e) Cosmic rays f) Lasers g) All of the above ll Learning Objectives - Here is what you should get out of this weeks lectures and Chapter 27 - To use the principle of super osition to calculate the electric field 0 multiple charges and of continuous charge distributions - To learn the electric field of common charge distributions - To learn the electric field of a parallel- plate capacitor and some of its applications - To study the motion of charged articles and dipoles in simple electric fie ds Physical Example Last class we introduce the concept of electric fields to explain the interaction of charge at a distance - Electric Fields are re5ponsible for the functioning of your LCD monitor, stereo, heart, brain Last class we introduced the electric field of a point charge - To make ractical use of electric fields we need to calculate the electric ield due to complicated distributions of charge - note that these are sources Primary goal today is to develop procedures for calculating the electric field for Specific arrangements of charge - After we know how to calculate electric field due to various source charge distributions we can compute the force on a test charge placed at some position in the resulting electric field \ p-ir'. dutgc \u Illlllillt'h vu-lc \ din-gm! ~g‘v.’icw ,— \ \Jf"’\’|‘. Hx‘ + \u Ii.lnllili'l_\ Ii my .. + + + gluuycd \urr - 4- + + _- 4- ~ Principle of Superposition Electric Field due to multiple point charges Net force is F0=F01+F02+F03++°°°+ﬁ0n As determined from Coulomb‘s Law -. 1 |q0|lql| A “ Fm = 4m 2 r Thus the electric field E is 0 r Et=130=FOI+F02+F03+...+F011 Q0 20 go go 51.0 = E0|+E02+E03+”°+E0n i.e. the principle of superposition applies to E as well. ...
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## This note was uploaded on 10/16/2009 for the course PHYSICS phys1004 taught by Professor Someone during the Spring '09 term at Carleton CA.

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ch27 - Lecture 5 Electric Field Reading Quiz ° What is The...

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