Which of the solenoids described below has the greatest magnetic field along its axis?
A)
a solenoid of length L, with N turns and a current I
B)
a solenoid of length L, with N/2 turns and a current I
C)
a solenoid of length L/2, with N/2 turns and a current I
D)
a solenoid of length 2L, with N turns and a current I/2
E)
a solenoid of length 2L, with 2N turns and a current 2I
E
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A continuous blackbody spectrum provides information about the surface temperature of the object.
Answer the following statement true (T) or false (F)
A point charge of +2.5 ?C is located at the origin of a coordinate system and a second point charge of ?5.6 ?C is at x = 1.9 m. At what point on the x axis is the electrical potential zero?
a. +4.3 m b. +5.3 m c. +0.59 m d. +11 m e. +1.3 m
Parallels
a)are imaginary north-south lines b)are each half circles reaching from pole to pole. c)run east-west around Earth. d)are all full circles the same length of the equator.
A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence,
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5 
B. 30.0
C. 20.2
D. 5.70
E. this cannot happen