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hw04 - Version 001 HW04 gavrin(25111 This print-out should...

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Version 001 – HW04 – gavrin – (25111) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. ChargedRod 001 10.0points A rod 8 . 7 cm long is uniformly charged and has a total charge of - 16 . 9 μ C. Determine the magnitude of the elec- tric field along the axis of the rod at a point 20 . 3137 cm from the center of the rod. The Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . Correct answer: 3 . 85777 × 10 6 N / C. FloatingStyrofoam 002 10.0points A 6 . 1 g piece of Styrofoam carries a net charge of - 0 . 5 μ C and floats above the center of a very large horizontal sheet of plastic that has a uniform charge density on its surface. The acceleration of gravity is 9 . 8 m / s 2 and the permittivity of free space is 8 . 85419 × 10 - 12 C 2 / N / m 2 . What is the charge per unit area on the plastic sheet? Correct answer: - 2 . 11721 μ C / m 2 . ChargedNonconductingPlate 003 10.0points A nonconducting plate with infinite dimen- sions carries a uniform surface charge density of 8 . 97 μ C / cm
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