Homework, 6 General Physics

Homework, 6 General Physics - General Physics II Homework 6...

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General Physics II Homework 6 Worked Examples Giancoli: 17.45, 18.8, 18.9, 18.15, 18.17, 18.21, 18.25 45. The capacitance is found from Eq. 17-7, with the voltage given by Eq. 17-4 (ignoring the sign). The plate area is found from Eq. 17-9. 8. Find the current from the voltage and resistance, and then find the number of electrons from the current. 9. Find the potential difference from the resistance and the current. 15. Use Eq. 18-3 to express the resistances, with the area as , and so . The diameter of the tungsten should be 4.6 mm. 17. Use Eq. 18-4 multiplied by so that it expresses resistance instead of resistivity. So raise the temperature by to a final temperature of . 21. In each case calculate the resistance by using Eq. 18-3 for resistance. (a) (b) (c) 25. The total resistance is to be 4700 ohms at all temperatures. Write each resistance in terms of Eq. 18-4 (with ), multiplied by to express resistance instead of resistivity. For the above to be true, the terms with a temperature dependence must cancel, and the terms

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Unformatted text preview: without a temperature dependence must add to . Thus we have two equations in two unknowns. Problems Giancoli: 17.44, 18.10, 18.23, 18.24 Also: P1: Understand and write the solution of the example of page 82'' of the notes. P2: In the circuit below, express your results in terms of the quantities C and V . a) Find the charge Q . b) What the potential difference V ab ? c) Find the total electrostatic energy U stored in all the capacitors together. P3: The capacitors in the figure below are initially uncharged and are connected as in the diagram with switch S open. The applied potential difference is V ab = +210 V. a) What is the potential difference V cd ? b) What is the potential difference across each capacitor after switch S is closed? c) How much charge flowed through the switch when it was closed?...
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