Two point charges of values +2.0 and +5.5 ?C, respectively, are separated by 0.50 m. What is the potential energy of this 2-charge system? (ke = 8.99 × 10^9 N?m2/C2)
a. +0.50 J
b. ?0.20 J
c. +0.20 J
d. ?0.41 J
e. +0.41 J
c
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The polarization in a vacuum capacitor is equal to _________.
Fill in the blank(s) with the appropriate word(s).
Tycho Brahe's contribution to Kepler's Laws of Planetary Motion was:
A) his detailed and accurate observations of the planet's position. B) his observations of Jupiter's moons. C) a mathematical explanation of epicycles. D) a precise lunar calendar. E) the correct explanation of lunar phases.
A wire contains a steady current of 2 A. The number of electrons that pass a cross section in 2 s is:
A) 2 B) 4 C) 6.3 × 1018 D) 1.3 × 1019 E) 2.5 × 1019
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H
When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
A.
b.
B.
c.
C.
d.
D.
e.
E.