1-3 - Create assignment 00224 Homework 3 Feb 01 at 8:46 pm 1 This print-out should have 13 questions Multiple-choice questions may continue on the

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Unformatted text preview: Create assignment, 00224, Homework 3, Feb 01 at 8:46 pm 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Conceptual 17 01 23:07, highSchool, numeric, > 1 min, normal. 001 The electric field at a point in space is defined as the force per unit charge at that point in space. We can write the electric field E of a charge q at a distance d from that charge, experienced by a charge Q, as E = F Q = k q d 2 The electric field has a direction such that it points toward negative charges and points away from positive charges. Suppose your rub a balloon in your hair and it acquires a static charge of 3 × 10- 9 C. What is the strength of the electric field created by the balloon at a location 1 m due north of the balloon? Correct answer: 27 N / C. Explanation: Let : k = 9 × 10 9 N · m 2 / C 2 , q = 3 × 10- 9 C , and d = 1 m . E = k q d 2 = (9 × 10 9 N · m 2 / C 2 ) 3 × 10- 9 C (1 m) 2 = 27 N / C . 002 What is the direction of that electric field? 1. south correct 2. north 3. east 4. west 5. downward 6. upward Explanation: The direction of the electric field is toward the balloon, or south. 003 You hair acquired an equal amount of positive charge when you rubbed the balloon on your head. What is the strength of the electric field created by your head, at the location of your feet, 1.5 meters below? Correct answer: 12 N / C. Explanation: Let : d = 1 . 5 m . E = k q d 2 = (9 × 10 9 N · m 2 / C 2 ) 3 × 10- 9 C (1 . 5 m) 2 = 12 N / C . 004 What is the direction of that electric field? 1. south 2. north 3. east 4. west 5. downward correct 6. upward Explanation: The direction of the electric field is away from your head, or down. Create assignment, 00224, Homework 3, Feb 01 at 8:46 pm 2 keywords: Electric Force and Field 23:07, trigonometry, numeric,...
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This note was uploaded on 04/08/2011 for the course PHYS 1402 taught by Professor Avram during the Spring '10 term at Austin Community College.

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1-3 - Create assignment 00224 Homework 3 Feb 01 at 8:46 pm 1 This print-out should have 13 questions Multiple-choice questions may continue on the

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