Magnetic Field of a Current Loop: A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop outside the loop, the magnetic field lines caused by this current
A. circle the loop in a clockwise direction.
B. circle the loop in a counterclockwise direction.
C. point straight up.
D. point straight down.
Answer: D
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importantly on
The most important acid involved in chemical weathering is
a. carbonic acid. b. sulfuric acid. c. hydrochloric acid. d. none of these.
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.
A light ray reflects from a surface. If the angle of incidence is 
what is the angle between the reflected ray and the incident ray at the surface?
a. 
b. 
c. 
d. 
e. 