A long, vertical, metallic wire carries downward electric current. What is the direction of the magnetic field it creates at a point 2 cm horizontally east of the center of the wire?
1.north
2.south
3.east
4.west
5.up
2
Physics & Space Science
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Electrons with greater potential energies relative to the atomic nucleus are
A) inner electrons. B) outer electrons. C) both the same
Physics & Space Science
The focal length of the objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of this telescope?
A) 8.0 m B) 1.4 m C) 0.90 m D) 1.6 m E) 1.8 m
Physics & Space Science
A lens of focal length 1500 mm is used to project an in image of the sun. If the sun subtends an angle of 
what is the diameter of the image?
A. 60 mm B. 30 mm C. 26 mm D. 6.5 mm E. 13 mm
Physics & Space Science
A radio wave and a visible light wave differ only in
A) frequency. B) energy per photon. C) both of these D) none of these
Physics & Space Science