As a coil is removed from a magnetic field an emf is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which
A)
acts at right angles to the coil's motion.
B)
acts in the direction of the coil's motion.
C)
causes the coil to tend to flip over.
D)
acts in the direction opposite to the coil's motion.
D
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Which of the following statements is true of medium-mass stars?
A) They never ignite their hydrogen shells and cannot become giant stars. B) They have interiors that are completely mixed by convection. C) In such stars, the helium ash accumulates in an inert helium core surrounded by unprocessed hydrogen. D) During red giant stages, these stars tend to gain mass due to strong stellar winds.
Applications to Astronomy: The appearance of the great range of brightness among stars is due to
A. only to the differences in the amount of light different stars emit. B. only to the differences in the distances of stars from us. C. both of these differences indicated. D. None of these answers.
A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 42 mph. In which direction is the plane pointed?
a. 5.7° W of N c. 22° W of N b. 12° W of N d. 11° E of N
Force on a Wire: A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure. If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section CD 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. The force is zero.