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Practice HW 2

# Practice HW 2 - lim(kl9356 Practice HW 2 Weathers(22202...

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lim (kl9356) – Practice HW 2 – Weathers – (22202) 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Suppose that 3 g of hydrogen, H 2 , is separated into electrons and protons, and that the pro- tons are placed at the Earth’s North Pole and the electrons are placed at the South Pole. The radius of the Earth is 6 . 37 × 10 6 m. Avogadro’s number is 6 . 02214 × 10 23 and the molar mass of the H-atom is 1 . 00782 g / mole. What is the resulting compressional force on the Earth? Answer in units of N. 002 10.0 points Two charges are located in the ( x, y ) plane as shown in the figure below. The fields pro- duced by these charges are observed at a point p with coordinates (0 , 0). The Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . 7 . 7 C 8 C p 1 . 6 m 1 . 5 m 3 m 2 . 8 m Use Coulomb’s law to find the x -component of the electric field at p . Answer in units of N / C. 003 (part 1 of 2) 10.0 points Consider three charges arranged as shown. + + 3 . 44 cm 2 . 9 cm 4 . 48 μ C 5 . 17 μ C 3 . 79 μ C The acceleration due to gravity is 9 . 8 m / s 2 . The Coulomb constant is 8 . 98755 × 10 9 N m 2 / C 2 . What is the electric field at a point 1 . 92 cm to the left of the middle charge? Answer in units of N / C. 004 (part 2 of 2) 10.0 points What is the magnitude of the force on a 3 . 79 μ C charge placed at this point? Answer in units of N. 005 (part 1 of 2) 10.0 points Three point charges are placed at the vertices of an equilateral triangle.

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