Chapter 4: Q12DQ (page 777)
If the electric potential at a single point is known, can Eat that point be determined? If so, how? If not, why not?
We can calculate the electric field from the changing of the potential energy. 80, in this case, We can‘t determine the electric energy.
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In Europe the standard voltage in homes is 220 V instead of the 120 used in the United States. Therefore a “100-W” European bulb would be intended for use with a 220-V potential difference (see Problem 25.36). (a) If you bring a “100-W” European bulb home to the United States, what should be its U.S. power rating? (b) How much current will the 100-W European bulb draw in normal use in the United States?
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?
The magnetic force on a moving charged particle is always perpendicular to the magnetic field. Is the trajectory of a moving charged particle always perpendicular to the magnetic field lines? Explain your reasoning.
The text states that good thermal conductors are also good electrical conductors. If so, why don’t the cords used to connect toasters, irons, and similar heat-producing appliances get hot by conduction of heat from the heating element?
A particle with massand a charge of has, at a given instant, a velocity.What are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field?
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