Four identical point charges (+4.0 ?C) are placed at the corners of a square which has 20-cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?
a. +2.9 J
b. +3.9 J
c. +2.2 J
d. +4.3 J
e. +1.9 J
b
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A 2.5-mC charge is on the y-axis at y = 3.0 m and a 6.3-mC charge is on the x-axis at x = 3.0 m. What is the direction of the potential at the origin?
A. 22.0
B. 168
C. 292
D. 332
E. potential has no direction
Why does a cloud collapse rapidly at first, and then slow down as it gets denser?
What will be an ideal response?
Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire?
a. The wire will be forced toward the north pole.
b. The wire will be forced perpendicular to the plane of the magnetic field, into the page.
c. The wire will be forced perpendicular to the plane of the magnetic field, out of the page.
d. The current will cease flowing.
e. The wire will be forced toward the south pole.
The Milky Way galaxy is about
A) 4 light years in diameter. B) 40 light years in diameter. C) 100 light years in diameter. D) 100,000 light years in diameter.