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Lecture_5_Problems_01-29-2010

# Lecture_5_Problems_01-29-2010 - Problem2:...

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Problem 2 (1/18/08) : Two positive point charges are located on the x axis as shown and are separated by 1.0 m. The magnitude of each charge is given in the figure. How far from charge 1 should a third charge be placed on the x axis between the two charges such that it feels no force? What does the sign of the third charge have to be? Does it matter? x 1 2 +5 0 C +7 5 C +5.0 C +7.5 C 1.0 m

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Problem 3 (1/18/08): Your body is composed of approximately 5 x 10 27 hydrogen atoms, each one with a single proton and electron, so that you are electrically neutral. Suppose, however, that you are standing 0.5 m away from your friend, and each of you has just 1% more protons than electrons. Calculate the repulsive force between you.
Problem 4 (1/18/08): Three point charges are fixed to the vertices of an equilateral triangle as shown below. Calculate the magnitude and direction of the net force that acts on the +3.5 μ C charge. State the direction relative to the positive x axis.

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