In an RL series circuit connected to a dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed at t = 0 s. What is the time constant of this circuit?
A) 0.80 s
B) 1.5 s
C) 2.5 s
D) 3.5 s
E) 5.5 s
D
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Which scientific theory or theories of the atom agrees with all of the atomic experiments performed to date?
A) The quantum theory of the atom. B) The planetary theory of the atom. C) The Greek theory of the atom. D) Both the planetary theory and the quantum theory of the atom. E) None of the above theories agree with all of the atomic experiments performed to date.
A capacitor of capacitance C takes 2 s to reach 63% of its maximum charge when connected in series to a resistance R and a battery of emf
How long does it take (from zero initial charge) for this capacitor to reach 95% of its maximum charge? A) 3 s B) 5 s C) 7 s D) 4 s E) 6 s
The energy source at the center of our galaxy is called
a. Cygnus X-1. b. the Orion arm. c. the Sun. d. Sagittarius A.
The phase angle of an ac circuit is 63°. What is the power factor?
A) 0.45 B) 0.55 C) 0.89 D) 0.11