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Chapter 19: Q47P (page 799)
When a thin-filament light bulb is connected to two batteries in series, the current isWhat is the resistance of the glowing thin-filament bulb?
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A certain has rectangular platesby and the gap width is . What is its capacitance? We see that typical capacitances are very small when measured in farads. A role="math" localid="1662139654139" capacitor is quite extraordinary. Apparently it has a very large area (all wrapped up in a small package), and a vary small gap .
A circuit consists of a battery, whose emf is K, and five Nichrome wires, three thick and two thin as shown in Figure 19.78. The thicknesses of the wires have been exaggerated in order to give you room to draw inside the wires. The internal resistance of the battery is negligible compared to the resistance of the wires. The voltmeter is not attached until part (e) of the problem. (a) Draw and label appropriately the electric field at the locations marked × inside the wires, paying attention to appropriate relative magnitudes of the vectors that you draw. (b) Show the approximate distribution of charges for this circuit. Make the important aspects of the charge distribution very clear in your drawing, supplementing your diagram if necessary with very brief written descriptions on the diagram. Make sure that parts (a) and (b) of this problem are consistent with each other. (c) Assume that you know the mobile-electron density n and the electron mobility u at room temperature for Nichrome. The lengthsand diameters of the wires are given on the diagram. Calculate accurately the number of electrons that leave the negative end of the battery every second. Assume that no part of the circuit gets very hot. Express your result in terms of the given quantities . Explain your work and identify the principles you are using. (d) In the case that , what is the approximate number of electrons that leave the negative end of every second? (e) A voltmeter is attached to the circuit with its + lead connected to location B (halfway along the leftmost thick wire) and its - lead connected to location C (halfway along the leftmost thin wire). In the case that , what is the approximate voltage shown on the voltmeter, including sign? Express your result in terms of the given quantities .
The deflection plates in an oscilloscope are 10cm by 2cm with a gap distance of 1mm. A 100V potential difference is suddenly applied to the initially uncharged plates through a resistor in series with the deflection plates. How long does it take for the potential difference between the deflection plates to reach 95V?
When a single thin-filament bulb is connected to a battery, the current through the battery is aboutIf you add another thin-filament bulb in parallel, the battery current of course increase to. Is the battery ohmic? That is, is the current through the battery proportional to the potential difference across the battery?
A certain 6 V battery delivers 12 A when short circuited. How much current does battery deliver when resistor is connected to it?
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