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S97 - Physics 4B FIRST EXAM Chapters 22 24 Spring 1997 Name...

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Physics 4B FIRST EXAM Chapters 22 - 24 Spring 1997 1 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. For full credit you must explain clearly what you are doing especially if your solution involves symmetry arguments or uses Gauss's Law. 1. The charge q 1 =+12.0μC has a mass of 3.00g and the charge q 2 =-8.0μC has a mass of 5.00g. At some instant in time they are a distance 3.20cm apart as shown at the right. Find (a)the magnitude and direction of the electric force on the charge q 1 , (b)the magnitude and direction of the electric force on the charge q 2 , (c)the magnitude and direction of the acceleration of the charge q 1 and (d)the magnitude and direction of the acceleration of the charge q 2 . Ignore gravity. (a)The force is given by Coulomb’s Rule, F 12 = k q 1 q 2 2 r = (8.99x10 9 ) (12.0x10 - 6 )(8.0x10 - 6 ) (0.0320) 2 = 843N .

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