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Part A How many excess electrons must be added to one plate and removed from the other to give a 5.15 nF parallel-plate capacitor 24.5 J of stored energy? VO ? N = Submit Request Answer Part B How could you modify distance between the plates of this capacitor to get it to store 49.0 J of energy without changing the charge on its plates? VI ? do Submit Request Answer Provide FeedbackPart A The paper dielectric in a paper-and-foil capacitor is 8.25x10-2mm thick. Its dielectric constant is 2.00, and its dielectric strength is 45.0 MV /m . Assume that What area of each plate is required for a 0.300 /F capacitor? the geometry is that of a parallel-plate capacitor, with the metal foil serving as the plates. AEQ ? A = m2 Submit Request Answer Part B If the electric field in the paper is not to exceed one-half the dielectric strength, what is the maximum potential difference that can be applied across the capacitor? AEd ? V = V Submit Request Answer Provide FeedbackV Part A Typical household currents are on the order of a few amperes. If a 1.60 A current flows through the leads of an electrical appliance, how many electrons per second pass through it? IVO AEQ ? electrons per second Submit Request Answer Part B If a 1.60 A current flows through the leads of an electrical appliance, how many coulombs pass through it in 6.50 min ? ? C Submit Request Answer Part C If a 1.60 A current flows through the leads of an electrical appliance, how long does it take for 7.38 C of charge to pass through? IVO ? Submit Request AnswerPart A During lightning strikes from a cloud to the ground, currents as high as 2.9x104 A can occur and last for about 37 us . How much charge is transferred from the cloud to the earth during such a strike? Express your answer using two significant figures. AEQ C Submit Request AnswerPart A Copper has 8.5x1028 electrons per cubic meter. How many electrons are there in a 20.0 cm length of 12-gauge copper wire (diameter 2.05 mm)? Express your answer using two significant figures. AEQ ? N = electrons Submit Request Answer V Part B If a current of 2.25 A is flowing in the wire, what is the average drift speed of the electrons along the wire? (There are 6.24x1018 electrons in 1 coulomb of charge.) Express your answer to two significant figures and include the appropriate units. HA ? V= Value Units Submit Request AnswerV Part A A 14.0 gauge copper wire of diameter 1.628 mm carries a current of 11.0 mA . What is the potential difference across a 1.75 m length of the wire? VO AEQ V = V Submit Request Answer Part B What would the potential difference in part A be if the wire were silver instead of copper, but all else was the same? AEd ? V = V Submit Request AnswerV Part A You want to precut a set of 1.59 $ strips of 14.0 gauge copper wire (of diameter 1.628 mm ). How long should each strip be? AEd ? L = m Submit Request AnswerPart A A wire 6.40 m long with diameter of 2.15 mm has a resistance of 0.0320 0 . Find the resistivity of the material of the wire. VO AEQ ? p = n . m Submit Request AnswerV Part A An aluminum bar 3.70 m long has a rectangular cross section 1.14 cm by 5.18 cm . What is its resistance? VO AEd FOE ? R = Submit Request Answer Part B What is the length of a copper wire 1.45 mm in diameter having the same resistance? AEd ? L = m Submit Request