Lenz's Law: A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is kept fixed while the ring is dropped, what is the direction of the current induced in the ring, as viewed from below the ring?
A. There is no current in the ring.
B. counterclockwise
C. clockwise
Answer: C
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The big bang only created hydrogen and helium (with miniscule amounts of lithium) because____
a. gamma ray photons disrupt large nuclei more easily b. antimatter is attracted to large nuclei, leaving only light nuclei c. heavier elements can only be formed through fusion d. elements with an atomic weight of 5 or 8 are unstable e. temperatures were high enough to fuse hydrogen, but not helium
Plutons are
a. bodies of intrusive igneous rocks. b. solids made of tephra. c. active volcanoes. d. extinct volcanoes.
The finite wire shown below has a uniformly distributed negative charge. Which of the arrows below is closest to the direction of the field vector that the wire produces at point P? (Point to a letter on the back cover with two fingers to specify a double-letter answer.)
A. A
B. B
C. C
D. D
E. AA
F. BBG. CC
H. DD
What is the equivalent capacitance of the combination shown?
a.
29 ?F
b.
10 ?F
c.
40 ?F
d.
25 ?F
e.
6.0 ?F