Physics: Questions & Answers

Physics: Questions & Answers (a) In Checkpoint 5, if the dipole moment is rotated from orientation 2 to orientation 1 by an external agent, is the work done on the dipole by the agent positive,negative,or zero? (b) Rank the work done on the dipole by the agent for these three rotations, greatest first:2->1,2->4,2->3. (CHAPTER 28) - CORRECT ANSWER- a.) Positive b.) w2->1 = w2->4 > w2->3 (a) In Fig. 27-18a, are resistors R1 and R3 in series? (b) Are resistors R1 and R2 in parallel? (c) Rank the equivalent resistances of the four circuits shown in Fig.27-18,greatest first. - CORRECT ANSWER- a.) not in series b.) are parallel c.) Equivalent of circuit resistances of the four circuits is the same A charged capacitor and an inductor are connected at time t = 0.In terms of the period T of the resulting oscillations,what is the first later time at which the following reach a maximum: (a) UB, (b) the magnetic flux through the inductor, (c) di/dt, and (d) the emf of the inductor? - CORRECT ANSWER- a.) 1/4(T) b.) 1/4(T) A resistor R1 is wired to a battery, then resistor R2 is added in series. Are (a) the potential difference across R1 and (b) the current i1 through R1 now more than,less than,or the same as previously? (c) Is the equivalent resistance R12 of R1 and R2 more than,less than,or equal to R1? (CHAPTER 27) - CORRECT ANSWER- a.) Same b.) Less c.) Less After the switch in Fig.27-15 is closed on point a,there is current i through resistance R.Figure 27-23 gives that current for four sets of values of Rand capacitance C:(1)R0 andC0,(2) 2R0 andC0, (3) R0 and 2C0,(4) 2R0 and 2C0.Which set goes with which curve - CORRECT ANSWER- you're good