Chapter 4: Q21DQ (page 981)
A type-II superconductor in an external field betweenandhas regions that contain magnetic flux and have resistance, and also has superconducting regions. What is the resistance of a long, thin cylinder of such material?
Resistance will remain zero.
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When is a 1.5 - VAAA battery not actually a 1.5 - V battery? That is, when do this its terminals provide a potential difference of less than 1.5 V ?
When a resistor with resistance Ris connected to a 1.50-V flashlight battery, the resistor consumes 0.0625 W of electrical power. (Throughout, assume that each battery has negligible internal resistance.) (a) What power does the resistor consume if it is connected to a 12.6-V car battery? Assume that Rremains constant when the power consumption changes. (b) The resistor is connected to a battery and consumes 5.00 W. What is the voltage of this battery?
When switch Sin Fig. E25.29 is open, the voltmeter V reads 3.08 V. When the switch is closed, the voltmeter reading drops to 2.97 V, and the ammeter A reads 1.65 A. Find the emf, the internal resistance of the battery, and the circuit resistance R. Assume that the two meters are ideal, so they don’t affect the circuit.
Fig. E25.29.
Electric eels generate electric pulses along their skin that can be used to stun an enemy when they come into contact with it. Tests have shown that these pulses can be up to and produce currents of (or even larger). A typical pulse lasts for . What power and how much energy are delivered to the unfortunate enemy with a single pulse, assuming a steady current?
(a) What is the potential difference in the circuit of Fig. P25.62? (b) What is the terminal voltage of the battery? (c) A battery with emf and internal resistance is inserted in the circuit at d, with its negative terminal connected to the negative terminal of the battery. What is the difference of potential between the terminals of the battery now?
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