Sample Problem Test1

Sample Problem Test1 - Physics 1302 Fall 2007(J Miller...

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Physics 1302, Fall 2007 (J. Miller), Sample Problems for Hour Exam #1 e = 1.6 x 10 -19 C, ε 0 = 8.85 x 10 -12 F/m or C 2 /(N·m 2 ), k = 8.99 x 10 9 N·m 2 /C 2 , μ 0 = 4 π x 10 -7 N/A 2 or H/m (H = Henry) 1. When the distance between two charges is reduced by half, the force between them is ___. Answer: quadrupled . 2. Two charges, Q 1 and Q 2 , are separated by certain distance R . If the magnitudes of their charges are both tripled, and their separation is tripled, then what happens to the electrical forces between the charges? Answer: It remains the same . 3. Three point charges of equal magnitude and varying signs are placed on the corners of a square of side d , as shown in the figure below. In what direction is the total electric field, at the center of the square, pointing? Answer: A . 4. A charged particle traveling along the – x -axis enters an electric field directed vertically downward along the – y -axis. If the particle experiences a force downward because of this field, what is the sign of the charge on this particle?
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