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P114 - PROBLEM SET 1 Homework to be handed in by 1800 hours on Tuesday 30 January 2007 . [1] Electric and gravitational forces. a) What would be the protons mass if the gravitational force between two protons at rest were to equal the electric force? How does this compare with its actual mass? b) What would be the electric force between two dimes (each of mass 2gm) placed at opposite ends of a 10 meter lecture table if their nuclear and electronic charges were unbalanced by 1%. Can you think of some object whose weight equals that force? [2] A 2 10 6 C charge is at the center of a cube of side 20 cm. What is the electric f ux through one of the faces of the cube? [3] Four charges of equal magnitude, | q | = 2 10 18 C, are arranged at the four corners of a square of side L = 5 cm as shown in the F gure. Calculate the magnitude, in Newtons, and the direction of the force acting on the lower-left corner charge due to the presence of the other charges. [4] Two charges + q and 3 q are separated by a small distance. Draw the electric- F eld lines for this system.... View Full Document

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