1. At t=0, a 12.0-V battery is connected in series with a 220-mH inductor and a total of 30-Ω resistance. Which is correct? (A) at t=0, the current is 0.40 A; (B) as t → ∞, the current decays to zero; (C) the time constant is about 7.3 ms; (D) it take 50 s for the current to reach half its maximum possible value.

2. Which of the following statement is NOT the second law of thermodynamics? (A) the entropy of a closed system can never decrease; (B) the entropy of the universe can never decrease; (C) it is impossible to construct a refrigerator operating in a cycle whose sole effect is to transfer heat from a cooler object to a hotter one; (D) the change in the internal energy of a system depends only on the net heat transferred to the system and the net work done by the system, independent of the particular processes involved.

相關試題

相關試卷