# mt1_key - PHY-2054 B001 Fall 2008 Instructor Dr...

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PHY-2054 B001, Fall 2008 Instructor: Dr. Bhattacharya Test #1, Tuesday, Sept 30, 3:00 pm - 4:15 pm KEY Please PRINT your name TO GET FULL CREDIT YOU MUST SHOW YOUR WORK There are 6 questions in this test. Questions 1,2, 5, and 6 each worth 20 points. Questions 3 and 4 are short and each worth 10 points. Useful informations for this test are provided on a separate sheet of paper. You are not allowed to use any other information excepting those provided in this information sheet. While answering each question please be as clear and specific as possible in explaining your notation, formula used, etc . Please use appropriate units in each case as necessary.

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1. Two positive charges 8 nC and 16 nC are separated by 50 cm as shown in the accompanying figure. B A 10cm 10cm 8nC 16nC 50cm (a) Find the magnitude and direction of the net electric field at the point A. E = k parenleftbigg 8 × 10 9 (0 . 1) 2 - 16 × 10 9 (0 . 4) 2 parenrightbigg N / C ˆx = 6300 N / C ˆx (b) Find the magnitude and direction of the net electric field at the point B.
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