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.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
The__________of a lens or mirror is the distance from that lens or mirror to the point where it focuses parallel rays of light
A) image distance B) focal length C) radius of curvature D) object distance
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A) Pairs of neutrons and protons were created. B) Electrons and positrons were created. C) Expansion cooled the universe enough that protons could capture electrons in orbit. D) Dark energy accelerated the cosmos on to infinity. E) The universe underwent a brief period of very rapid expansion.
Whenever the net force on an object is zero (¤F = 0), the object is said to be in mechanical equilibrium—this is known as the _______________________
Fill in the blank(s) with the appropriate word(s)