HW6problem_pdf

# HW6problem_pdf - luu(nml299 HW06 markert(58710 This...

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1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 3) 10.0 points a) An isolated capacitor has air between its plates. b) The capacitor is charged by a battery. c) AFter the capacitor is charged, the battery remains connected. d) A dielectric slab κ is then inserted between its plates. e) ±inally, the capacitor reaches equilibrium. Initially, the parallel-plate capacitor on the leFt whose capacitance is 2 . 65 n± is charged to an initial potential di²erence oF 134 V . The dielectric material has a dielectric con- stant κ = 3 . 65 . κ κ What is the charge across the capacitor on the right aFter the dielectric has been re- moved? 1. Q in = κQ out 2. Q in = 1 κ Q out 3. Q in = Q out V 002 (part 2 oF 3) 10.0 points What is the magnitude oF the work required when a dielectric slab κ is then inserted be- tween its plates? Answer in units oF J. 003 (part 3 oF 3) 10.0 points The potential energy oF the capacitor will be 1. smaller than it would have been without the dielectric being inserted. 2. the same as it would have been without the dielectric being inserted. 3. larger than it would have been without the dielectric being inserted. 004 10.0 points IF a metal wire carries a current oF 140 mA, how long does it take For 3.90 × 10 20 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude oF the charge on an electron is 1 . 6 × 10 - 19 C. Answer in units oF s. 005 10.0 points The fgure represents two possible ways to connect two lighbulbs to a battery. All oF the bulbs are identical. A B In which case will the total current running through the battery be greater? 1.

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## This note was uploaded on 09/22/2010 for the course PHY 58710 taught by Professor Markert during the Spring '09 term at University of Texas.

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HW6problem_pdf - luu(nml299 HW06 markert(58710 This...

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