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Chapter 4: Q14DQ (page 912)
Could an accelerator be built in which all the forces on the particles, for steering and for increasing speed, are magnetic forces? Why or why not?
No, an accelerator cannot be built with all the forces on the particles, for steering and increasing speed, is magnetic force.
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Question: A conducting sphere is placed between two charged parallel plates such as those shown in Figure. Does the electric field inside the sphere depend on precisely where between the plates the sphere is placed? What about the electric potential inside the sphere? Do the answers to these questions depend on whether or not there is a net charge on the sphere? Explain your reasoning.
You connect a battery, resistor, and capacitor as in Fig. 26.20a, where R = 12.0 Ω and C = 5.00 x 10-6 F. The switch S is closed at t = 0. When the current in the circuit has a magnitude of 3.00 A, the charge on the capacitor is 40.0 x 10-6 C. (a) What is the emf of the battery? (b) At what time t after the switch is closed is the charge on the capacitor equal to 40.0 x 10-6 C? (c) When the current has magnitude 3.00 A, at what rate is energy being (i) stored in the capacitor, (ii) supplied by the battery
The power rating of a light bulb (such as a 100-W bulb) is the power it dissipates when connected across a 120-V potential difference. What is the resistance of (a) a 100-W bulb and (b) a 60-W bulb? (c) How much current does each bulb draw in normal use?
The energy that can be extracted from a storage battery is always less than the energy that goes into it while it is being charged. Why?
A 5.00-A current runs through a 12-gauge copper wire (diameter
2.05 mm) and through a light bulb. Copper hasfree electrons per
cubic meter. (a) How many electrons pass through the light bulb each
second? (b) What is the current density in the wire? (c) At what speed does
a typical electron pass by any given point in the wire? (d) If you were to use
wire of twice the diameter, which of the above answers would change?
Would they increase or decrease?
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