An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by
a. Lenz's law.
b. increasing magnetic flux within the coils of the inductor.
c. increasing current in the coils of the inductor.
d. all of the above.
e. only (a) and (c) above.
d
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A journal bearing and rotating shaft as shown is lubricated with oil having viscosity of 800 cP. If the shaft is rotating at 2,000 rpm, determine the maximum oil temperature if both journal and shaft have a temperature of 60ºC.
Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
A) A main-sequence star is cooler and dimmer than it was as a protostar. B) A main-sequence star is cooler and brighter than it was as a protostar. C) A main-sequence star is hotter and brighter than it was as a protostar. D) A main-sequence star is hotter and dimmer than it was as a protostar.
A laser beam (? = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
a. 3.47 × 10^?3 b. 3.47 × 10^?2 c. 3.47 × 10^?4 d. 3.47 × 10^?6 e. 3.47 × 10^?5
The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 10^6 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?