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Unformatted text preview: MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assig... 1 of 8 17/4/07 15:35 [ Assignment View ] E lisfra i 2, vor 2007 23A. Electric PotentiAl ssignment is due At 2:00Am on WednesdAy, JAnuAry 31, 2007 Credit for problems submitted lAte will decreAse to 0% After the deAdline hAs pAssed. The wrong Answer penAlty is 2% per pArt. Multiple choice questions Are penAlized As described in the online help. The unopened hint bonus is 2% per pArt. You Are Allowed 4 Attempts per Answer. Electric Potential and Properties Electric Potential Energy versus Electric Potential Learning Goal: To understand the relationship and differences between electric potential and electric potential energy. In this problem we will learn about the relationships between electric force , electric field , potential energy , and electric potential . To understand these concepts, we will first study a system with which you are already familiar: the uniform gravitational field. Gravitational Force and Potential Energy First we review the force and potential energy of an object of mass in a uniform gravitational field that points downward (in the direction), like the gravitational field near the earth's surface. Part A Find the force on an object of mass in the uniform gravitational field when it is at height . Express in terms of , , , and . ANSWER: = Because we are in a uniform field, the force does not depend on the object's location. Therefore, the variable does not appear in the correct answer. Part B Now find the gravitational potential energy of the object when it is at an arbitrary height . Take zero potential to be at position . Express in terms of , , and . Note that because potential energy is a scalar, and not a vector, there will be no unit vector in the answer. ANSWER: = Part C In what direction does the object accelerate when released with initial velocity upward? ANSWER: upward downward upward or downward depending on its mass downward only if the ratio of to initial velocity is large enough Electric Force and Potential Energy Now consider the analogous case of a particle with charge placed in a uniform electric field of strength , MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assig... 2 of 8 17/4/07 15:35 pointing downward (in the direction) Part D Find , the electric force on the charged particle at height . Hint D.1 Relationship between force and electric field Hint not displayed Express in terms of , , , and . ANSWER: = Part E Now find the potential energy of this charged particle when it is at height . Take zero potential to be at position . Express (a scalar quantity) in terms of , , and ....
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This note was uploaded on 11/02/2009 for the course MASTERING PHYS taught by Professor All during the Spring '09 term at Kettering.
- Spring '09