4B_SP10_HW05

# 4B_SP10_HW05 - Print Assignment 4B Homework 05:true...

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4B Homework 05 *Question 1 The plates of a spherical capacitor have radii 49.2 mm and 52.9 mm. (a) Calculate the capacitance in picofarads. (b) What must be the plate area in square centimeters of a parallel-plate capacitor with the same plate separation and capacitance? (a) Number 78.3 Units pF (b) Number 327 Units cm^2 Answer a1: the number of significant digits is set to 3; the tolerance is +/-2% Answer b1: the number of significant digits is set to 3; the tolerance is +/-2% *Question 2 In Fig. 25-35, the capacitances are C 1 = 1.3 µF and C 2 = 4.3 µF, and both capacitors are charged to a potential difference of V = 120 V but with opposite polarity as shown. Switches S1 and S2 are now closed. (a) What is now the potential difference between points a and b ? What now is the charge in microcoulombs on capacitor (b) 1 and (c) 2? Figure 25-35 (a) Number 64 Units V (b) Number 84 Units μC (c) Number 280 Units μC Answer a1: the number of significant digits is set to 2; the tolerance is +/-2% Answer b1: the number of significant digits is set to 2; the tolerance is +/-2% Answer c1: the number of significant digits is set to 2; the tolerance is +/-2%

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4B_SP10_HW05 - Print Assignment 4B Homework 05:true...

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