2049_ch21 - Chapter 21: Coulomb's Law PHY2049: Chapter 21 1...

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PHY2049: Chapter 21 1 Chapter 21: Coulomb’s Law
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PHY2049: Chapter 21 2 1. What is net force on central –q charge? q
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PHY2049: Chapter 21 3 Answer to Question #1 Î The central charge is surrounded on all sides by charges that are equal and on opposite sides, so the forces cancel each other. Î The only exception is the +2q charge above the central charge. Thus the net force on the central charge is upward (attraction) with magnitude 2 2 2 kq F r =
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PHY2049: Chapter 21 4 2. Rank by magnitude of force. Assume charges are equally spaced.
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PHY2049: Chapter 21 5 Answer to Question #2 Î #3 has largest magnitude because all charges cause a force in the same direction. Î #4 has zero magnitude (smallest), because charges of equal magnitude are located equal distances on opposite sides. Î #1 is second largest because outer charges cancel and inner charges add. Î #2 is third largest because inner charges cancel and outer charges add. Î So the ranking (smallest to largest) 4, 2, 1, 3
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PHY2049: Chapter 21 6 3. What is magnitude and direction of force on charge q > 0? Assume charges are on perfect square of side L.
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2049_ch21 - Chapter 21: Coulomb's Law PHY2049: Chapter 21 1...

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