The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of
a. reflection.
b. refraction.
c. diffraction.
d. none of these.
b
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Consider a conducting bar that is free to slide along conducting rails in an upward magnetic field as shown in the diagram below. If we connect the rails to the battery shown, which way will the bar be pushed?
A.A
B.B
C.C
D.D
E. Down into the rails
F. Up off the rails
Observations of sunspots at different solar latitudes prove that the Sun, like the gas giants, rotates differentially
Indicate whether the statement is true or false
You place a box on a smooth and evenly-sanded wooden board. Raise one end of the board so that the angle increases. Eventually, the box starts to slide along the board. If you maintain this angle of the board, the box
1.will move at constant speed along the ramp. 2.will do none of these. 3.will slow down and stop along the ramp. 4.will speed up along the ramp.
Faraday's Law: A flat circular loop having one turn and radius 5.0 cm is positioned with its plane perpendicular to a uniform 0.60-T magnetic field. The area of the loop is suddenly reduced to essentially zero in 0.50 ms. What emf is induced in the loop?
Fill in the blank(s) with the appropriate word(s).