CH14 HW1 - WebAssign Ch14 HW1 S2010 (Homework) Kiyaniah...

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Unformatted text preview: WebAssign Ch14 HW1 S2010 (Homework) Kiyaniah Tilghman PY 208, section 003M, Spring 2010 Instructor: Keith Weninger Current Score : 19 / 19 Due : Tuesday, January 19, 2010 12:30 PM EST About this Assignment Extension Requests Question Points 1234 2188 Total 19/19 (100.0%) Description Electric field and electric force Instructions Reading: Sec 14.1-14.3 NOTE: Most questions allow 3 submissions per part, but some multiple choice questions may only allow 2 or even 1 submission. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 2/2 points All Submissions Notes Question: MI3 14.X.017 At location A there is an electric field in the direction shown by the orange arrow. This electric field is due to charged particles that are not shown in the diagram. If a proton is placed at location A, which of the arrows below best indicates the direction of the electric force on the proton? h h If the proton is removed and an electron is placed at location A, which of the arrows best indicates the direction of the electric force on the electron? d d 2. 1/1 points All Submissions Notes Question: MI3 14.X.016 10- An electron in a region where there is an electric field experiences a force of magnitude 3.5 16 N. What is the magnitude of the electric field at the location of the electron? 2187.5 2190 N/C Solution or Explanation 3. 8/8 points All Submissions Notes Question: MI3 14.P.023 In the region shown above there is an electric field due to charged objects not shown in the diagram. A tiny glass ball with a charge of 7e-09 coulomb placed at location A experiences a force of < - 5.6e-05, - 5.6e-05, 0> N, as shown in the diagram. Which arrow (a-j) best indicates the direction of the electric field at location A? f f What is the electric field at location A? < - 8000 - 8000 , - 8000 - 8000 , 0 > N/C What is the magnitude of this electric field? 11313.708 11300 N/C Now the glass ball is moved very far away. A tiny plastic ball, with charge - 8e-09 coulombs is placed at location A. Which arrow best indicates the direction of the electric force on the negatively charged plastic ball? b b What is the force on the negative plastic ball? < 6.4e-5 6.4e-05 , 6.4e-5 6.4e-05 , 0 > N You discover that the source of the electric field at location A is a negatively charged particle. Which of the blue circles below best indicates the location of the negatively charged particle that is the source of the field? 4 4 4. 8/8 points All Submissions Notes Question: MI3 14.P.022 In the region shown in the diagram above there is an electric field due to a point charge located at the center of the magenta circle. The orange arrows indicate the magnitude and direction of the electric field at the locations shown. What is the sign of the source charge? positive positive Now a particle whose charge is - 8e-09 C is placed at location A. Which arrow (a-j) best indicates the direction of the electric force on the - 8e-09 C charge? f f The electric field at location A has the value < 9000, 9000, 0 > N/C. What is the unit vector in the direction of at this location? < .707 0.707 , .707 0.707 , 0 > What is the electric force on the - 8e-09 C charge? < - 7.2e-5 - 7.2e-05 , - 7.2e-5 - 7.2e-05 , 0 > N What is the unit vector in the direction of this electric force? < - .707 - 0.707 , - .707 - 0.707 , 0 > Solution or Explanation The electric field due to a point charge points away from a positive source charge, or toward a negative source charge. ...
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This note was uploaded on 09/21/2010 for the course PY 005 taught by Professor Mattewk. during the Spring '10 term at N.C. State.

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