How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet.
b. Space debris was formed by the collision of objects after the planets formed.
c. Space debris is material that existed in our region of space before the sun formed.
d. Both a and b
e. All of the above
D
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What is the magnitude of the current in the 20-? resistor?
a.
0.75 A
b.
0.00 A
c.
0.25 A
d.
0.50 A
e.
1.00 A
What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
Which of the following is NOT true about scannability?
A. Use short paragraphs and bulleted lists. B. Begin paragraphs with a topic sentence. C. Use of only uppercase characters can increase scannability. D. All of the above are true.
A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
A. 59 mT B. 62 mT C. 65 mT D. 68 mT E. 31 mT