1. Consider an equilateral triangle of side 20 cm. a charge of +2.0 micro coulombs is placed at one vertex and charges of -4.0 microcoulombs are placed at the other two vertices. Determine the magnitude and direction of the electric field at the center of the triangle. 2. There is a 5.0 microcoulomb carge at each of 3 corners of a square (each side 70 mm long). what is the force on +6.0 micro coulombs placed at the center of the square? 3. Consider the x-axis with 4.0 micro coulombs at x=1.0 meter and -2.0 micro coulombs at the origin. Where should 6.0 micro coulombs be placed so that the net force on it is zero?
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