Equal currents of magnitude I travel out of the page in wire M and into the page in wire N. Eight directions are indicated by letters A through H
The direction of the magnetic field at point P is
a.
A.
b.
B.
c.
C.
d.
D.
e.
E.
c
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According to Kepler's 3rd law, we expect:
A. A more distant planet, e.g. Jupiter, to spin about its axis faster than the Earth B. A more distant planet to spin about its axis slower than the Earth C. An interior planet, e.g. Venus, to spin about its axis faster than the Earth D. none of the above
The CNO cycle produces energy by fusing
A. silicon into iron. B. hydrogen into helium. C. neon into magnesium and oxygen. D. carbon and nitrogen into oxygen.
The speed of light in the void between molecules in glass is
A) more than its speed in a vacuum. B) the same as its speed in a vacuum. C) less than its speed in a vacuum.
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