Magnetic Field of a Current Loop: A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm. If the magnetic field strength at its center is 1.1 mT with no external magnetic fields present, what is the magnitude of the current flowing through the wire? (?0 = 4? × 10-7 T ? m/A)
A. 7.0 A
B. 28 A
C. 14 A
D. 17 A
Answer: A
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The inductive reactance of a 20-mH inductor at a certain frequency is 120 ?. What is the frequency in rad/s?
A) 2000 rad/s B) 4000 rad/s C) 5000 rad/s D) 6000 rad/s E) 7000 rad/s
RC Circuits: A circuit contains a 2.0-M? resistor in series with an uncharged capacitor. When this combination is connected across an ideal battery, the capacitor reaches 25% of its maximum charge in 1.5 s. What is its capacitance?
Fill in the blank(s) with the appropriate word(s).
Simple molecules containing only carbon and hydrogen are referred to as
A) carbon hydrides B) hydrocarbons C) carbohydrides D) hydrogen carbides
Geological processes on the Earth's surface are directly related to
A) the reflectivity of its surface B) the composition of its atmosphere C) the rate of impacts D) internal heat