A vertical wire carries a current straight down. To the east of this wire, the magnetic field points
A)
north.
B)
east.
C)
west.
D)
south.
E)
down.
D
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What capacitance is needed in series with a 30 
resistor at 1.0 kHz for a total impedance of 45 
?
A. 34 
F
B. 15
F
C. 4.7F
D. 0.037F
An 83 lbm cast iron bracket is hung from a wire and a spring weigh scale as shown. What would be the reading of the scale and what is the apparent density of the bracket. Assume the density of the iron is 535 lbm/ft^3 and the density of water is 62.4 lbm/ft^3.
Which of these, both of the same length, has the greater electrical resistance?
A) a thick copper wire B) a thin copper wire C) both about the same D) need more information
A recent sunspot maximum occurred in 2001 . What is the year of the sunspot maximum that immediately follows the 2001 maximum if the solar cycle continues?
a. 2006 or 2007 b. 2012 c. 2018 d. 2023 e. the last cycle started a Maunder minimum and the next maximum cannot be predicted.