# E1sol - Phy sics 7B Answers for E1 rev 3.0 Page 1 E-1...

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Physics 7B Answers for E1 (rev. 3.0) Page 1 E-1. Coulomb’s Law Questions for discussion 1 . Coulomb’s Law for the electrostatic force between two point charges is F = qQ 4 "# 0 r 2 . ( ε 0 is constant, equal to 8.85 × 10 -12 C 2 /N m 2 , which determines the relative strength of the electric force. Some texts use the constant k C = 1/4 πε 0 , called Coulomb’s constant instead, which makes Coulomb’s Law look even more like Newton’s law of gravitation!) This looks a lot like Newton’s law for the gravitatational force between two point masses: F = GmM r 2 . And indeed, because both forces are “1/r 2 forces,” there are some mathematical similarities between them. However, all similarities aside, can you think of any important differences between electrostatic forces and gravitational forces? Perhaps the most important difference is that gravitational forces are always attractive, whereas electrostatic forces can be attractive or repulsive. 2 . Two point charges q 1 = +2 C and q 2 = -3 C are fixed in place along the x-axis, as shown. You have in your hand another point charge q, and you want to place it somewhere on the x-axis.

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E1sol - Phy sics 7B Answers for E1 rev 3.0 Page 1 E-1...

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