The magnitude of the magnetic force on a charge depends on
A. the velocity component perpendicular to the magnetic field.
B. the magnitude of the charge.
C. the magnitude of the magnetic field.
D. the sign of the charge.
E. Three of the items are correct.
E. Three of the items are correct.
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According to the law of Malus, the transmitted intensity of a polarized beam of light passing through a polarizer is unchanged for an angle of 90°
Indicate whether the statement is true or false
A lab specimen is 15.2 mm from a convex lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?
A) 6.8 mm B) 5.4 mm C) 1.7 mm D) 0.68 mm
Using the assumption that it takes several billion years for complex life to evolve in a stable environment, it is most likely that the stars with inhabited planets are:
A) G and K main sequence stars. B) white dwarf stars. C) A and B main sequence stars. D) neutron stars.
The index of refraction,n, is calculated as
A. the ratio of the speed of light in the material to that in a vacuum (n=v/c) B. the ratio of the speed of light in a vacuum to that in the material (n=c/v) C. the product of the speed of light in a vacuum to that in the material(n=vc) D. the square root of the speed of light in the material ?n? v?