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Physics Assignment

# Physics Assignment - Physics 122 TUTORIAL 1 Electric Field...

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Physics 122 Introductory Physics II TUTORIAL 1 Electric Field KEY Suggested practice problems from the textbook: Chapter 18, p.370, # 7, 11, 17, 23, 45. 1. Two identical conducting spheres are placed with their centers 0.30 m apart. One is given a charge of 12 x 10 -9 C and the other a charge of -18 x 10 -9 C. a) Find the electrostatic force exerted on one sphere by the other. b) The spheres are connected by a conductive wire. After equilibrium is occurred, find the electrostatic force between the two. 1

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2. Three charges are located along a straight line, as shown below. What is the net electric force on charge q 2 ? The forces on q 2 are shown in the diagram below. Using Coulomb's law: F 12 = kq 1 q 2 /r 12 2 = (8.99 × 10 9 N·m 2 /C 2 )(7.5 × 10 -6 C)(4.0 × 10 -6 C)/(0.40 m) 2 = 1.7 N. F 32 = kq 3 q 2 /r 32 2 = (8.99 × 10 9 N·m 2 /C 2 )(9.0 × 10 -6 C)(4.0 × 10 -6 C)/(0.60 m) 2 = 0.90 N. The net electric force on q 2 is therefore, F = F 12 - F 32 = 0.8 N to the left . 3. Three charges are located at the corners of an equilateral triangle, as shown below. What is

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Physics Assignment - Physics 122 TUTORIAL 1 Electric Field...

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