A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on this current?
A)
down
B)
north
C)
south
D)
east
E)
west
E
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Light that is shifted toward the color red due to the light passing very near a compact object is called ____________________
Fill in the blank(s) with correct word
A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
A. ?100 B. ?25 C. ?50 D. ?15 E. ?10
If water at 4°C slightly decreases in temperature, the water
A) contracts. B) expands. C) neither of these
Light of wavelength 420 nm is incident on a slit of width 0.20 mm, and a diffraction pattern is produced on a screen that is 1.80 m from the slit. What is the width of the central bright fringe? (1 nm = 10?9 m)
a. 3.8E–3 m b. 7.6E–3 m c. 1.2E–3 m d. 1.4E–2 m e. 2.0E–2 m