physics HW #2 - Physics 112 HW#2 April 9 2010 1 Two charges...

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Physics 112 HW #2 April 9, 2010 1. Two charges are placed on the x axis. One of the charges ( q 1 = +8.0 µC) is at x 1 = +3.1 cm and the other ( q 2 = -23 µC) is at x 2 = +9.1 cm. (a) Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction along the x -axis.) N/C (b) Find the net electric field (magnitude and direction) at x = +6.3 cm. (Use the sign of your answer to indicate the direction along the x -axis.) N/C 2. A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 7760 N/C. The mass of the water drop is 3.45 10 -9 kg. (a) Is the excess charge on the water drop positive or negative? positive negative Why? (b) How many excess electrons or protons reside on the drop? 3. The magnitude of each of the charges in the figure below is 9.10 10 -12 C. The lengths of the sides of the rectangles are 2.88 cm and 4.60 cm. Find the magnitude of the electric field at the center of the rectangle in the figures below.
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