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midterm-soln

# midterm-soln - Introduction to General Physics II Midterm...

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Introduction to General Physics II Midterm PHYS 1302 (20682) Summer 6W2 2009 Lau Name (Last, First) PS# Instructions 1. Solve 3 of the 4 problems. 2. Some useful constants and conversion factors: a. 9 2 2 8.99 10 N m /C k = × 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 3):

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2 1. Three point charges are fixed at the corners of a right-angled triangle (see figure below). The charges and distances are given in the figure. a. Find the electric force, magnitude and direction, acting on the -0.6- μ C charge due to the +0.8- μ C charge alone . (10) b. Find the electric potential at the mid-point between the +0.8- μ C charge and the -0.6- μ C charge due to all three charges. (15) c. Can the electric field due to all three charges be zero somewhere along the dotted line between the +0.8- μ C charge and the +1.0- μ C? (8) Solution a. The electric force on the -0.6- μ C charge due to the +0.8- μ C charge is 9 2 2 6 6 1 2 2 2 (8.99 10 / ) (0.6 10 ) (0.8 10 ) 0.7 (0.08 ) kq q N m C C C F N d m - - × × × × × = = = The direction is vertically up (+y) because it is an attractive force on the -0.6- μ C charge.
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midterm-soln - Introduction to General Physics II Midterm...

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