The direction of the force on a current-carrying wire in a magnetic field is
A) in the direction opposite to the current.
B) perpendicular only to the current.
C) perpendicular only to the magnetic field.
D) in same direction as the current.
E) perpendicular to both the current and the magnetic field.
E
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The redshift of the universe at decoupling was about:
A) Z = 1,000,000. B) Z = 400,000. C) Z = 1,100. D) Z = 10. E) Z = 4.
Which of the following is the smallest dwarf planet?
a. Ceres b. Mercury c. Pluto d. Eris
The presence of a magnetic field is a good indication that:
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) we have a liquid metal outer core, spinning rapidly as we rotate. D) the Earth's interior must be completely molten to the center. E) the Earth's interior has had time to solidify, with a rigid bar magnet created.
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.