Chapter 4: Q8DQ (page 911)
How might a loop of wire carrying a current be used as a compass? Could such a compass distinguish between north and south? Why or why not?
We would have to know the direction of the current in the loop in order to determine where is north and where is south.
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A cylindrical rod has resistance . If we triple its length and diameter, what is its resistance in terms of R
An alpha particle (a He nucleus containing two protons and two neutrons and having a mass of ) travelling horizontally at enter a uniform, vertical, magnetic field.(a) What is the diameter of the path followed by this alpha particle? (b) what effect does the magnetic field have on the speed of the particle? (c) What are the magnitude and direction of the acceleration of the alpha particle while it is in the magnetic field? (d) explain why the speed of the particle does not change even though an unbalanced external force acts on it.
High-voltage power supplies are sometimes designed intentionally to have rather large internal resistance as a safety precaution. Why is such a power supply with a large internal resistance safer than a supply with the same voltage but lower internal resistance?
Which of the graphs in Fig. Q25.12 best illustrates the current I in a real resistor as a function of the potential difference V across it? Explain.
In the circuit shown in Fig. E26.20, the rate at which R1 is dissipating electrical energy is 15.0 W. (a) Find R1 and R2. (b) What is the emf of the battery? (c) Find the current through both R2 and the 10.0 Ω resistor. (d) Calculate the total electrical power consumption in all the resistors and the electrical power delivered by the battery. Show that your results are consistent with conservation of energy.
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