Assignment 01

Assignment 01 - Class PEP112S2007 Assignment 1 Assignment...

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Class PEP112S2007 Assignment 1 Assignment is due at 11:00pm on Sunday, January 28, 2007 Credit for problems submitted late will decrease to 0% over the course of 10 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. The unopened hint bonus is 1% per part. You are allowed 10 attempts per answer. Reading Quiz 25.4 Part A The electric field of a charge is defined by the force on what kind of particle? ANSWER: An electron A proton A source charge A probe charge Repulsive Force between Two Spheres Two small spheres spaced 20.0 centimeters apart have equal charge. Part A
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How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is newtons? Hint A.1 How to approach the problem Hint not displayed Hint A.2 A note about the charge on the spheres Hint not displayed Part A.3 Calculate the charge on each sphere Part not displayed Hint A.4 The charge of an electron Hint not displayed ANSWER: PSS 25.1: What's the Point? Learning Goal: To practice Problem-Solving Strategy 25.1 for problems involving electrostatic forces. Two charged particles, with charges and , are located a distance apart on the x axis. A third charged particle, with charge , is placed on the x axis such that the magnitude of the force that charge 1 exerts on charge 3 is equal to the force that charge 2 exerts on charge 3. Find the position of charge 3. Assume that all three charges are positive. MODEL: Identify point charges or objects that can be modeled as point charges. VISUALIZE: Use a pictorial representation to establish a coordinate system, show the positions of the charges, show the force vectors on the charges, define distances and angles, and identify what you are
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trying to find. This is the process of translating words into symbols. SOLVE: The mathematical representation is based on Coulomb's law: . Show the directions of the forces--repulsive for like charges and attractive for opposite charges--on the pictorial representation. When possible, do graphical vector addition on the pictorial representation. Although this is not exact, it tells you the type of answer you should expect. Write each force vector in terms of its x and y components, then add the components to find the net force. Use the pictorial representation to determine which components are positive and which are negative. ASSESS: Check that your result has the correct units, is reasonable, and answers the question. Model Model the charged particles as point charges. Visualize Starting with the figure given here, complete the pictorial representation for this problem, including all of
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the elements listed in the problem-solving strategy. Use your drawing to answer the following questions. Part A
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Assignment 01 - Class PEP112S2007 Assignment 1 Assignment...

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