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midterm-sample

# midterm-sample - Introduction to General Physics II 1302...

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Introduction to General Physics II 1302 Midterm Sample Name (Last, First) PS#(Last 4 digits) Instructions 1. Solve 3 of the 4 problems. 2. Some useful constants and conversion factors: a. k = 9.00 × 10 9 N m 2 / C 2 b. μ 0 = 4 π × 10 - 7 T m / A c. ε 0 = 8.85 × 10 - 12 F / m d. 1 μ C = 10 - 6 C e. 1 μ F = 10 - 6 F 3. List the 3 problems you want to be graded before you turn in your test. ============================================================ Problems to be graded (list only four):

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2 1. Three point charges lie on a straight line as shown in the figure below. Their charges are indicated in the figure. Given q = +12 μ C and d = 0.50 m. a. Find the electric force, magnitude and direction, acting on the point charge q 1 due to the point charge q 3 . (8) b. Find the electric potential due to all three charges at the midpoint between q 3 and q 2 . (12) c. Can the electric field due to all three charges be zero somewhere between q 3 and q 2 ? Answer Yes or No. (5) Solution a. The electric force on the point charge q 1 due to the point charge q 3 is 9 2 2 6 6 1 2 2 2 (9.00 10 / ) (12 10 ) (36 10 ) 3.9 (1.00 ) kq q N m C C C F N d m - - × × × × ×
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