A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 27-6
If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil? A)
perpendicular to and into the page
B)
perpendicular to and out of the page
C)
in the direction of the magnetic field
D)
in the opposite direction of the magnetic field
E)
none
A
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Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction. The current in one wire is 20 A, and the current in the other wire is 5 A. If the magnetic force on the 20-A wire has magnitude F, what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present.
A. 4F B. 2F C. F D. F/2 E. F/4
Which statement below regarding the first law of thermodynamics is most correct?
a. A system can do work externally only if its internal energy decreases. b. The internal energy of a system that interacts with its environment must change. c. No matter what other interactions take place, the internal energy must change if a system undergoes a heat transfer. d. The only changes that can occur in the internal energy of a system are those produced by non-mechanical forces. e. The internal energy of a system cannot change if the heat transferred to the system is equal to the work done by the system.
According to the Big Bang theory, how many forces, and which ones, operated in the universe during the GUT era?
A) two forces: gravity and a single force that later became the strong, weak, and electromagnetic forces B) one force that represented the unification of all four forces that operate today C) three forces: gravity, the strong force, and the electroweak force D) two forces: the strong force and the electroweak force
A coin underwater (left) appears closer than an identical coin in air (right). A tiny fish located next to the coin underwater would see the outside observer:
a. appearing closer than the real distance. b. appearing farther than the real distance. c. appearing exactly at the correct distance.