The force on a current-carrying wire in a magnetic field is equal to zero when
A)
the current is parallel to the field lines.
B)
the current is at a 30° angle with respect to the field lines.
C)
the current is at a 45° angle with respect to the field lines.
D)
the current is at a 60° angle with respect to the field lines.
E)
the current is perpendicular to the field lines.
A
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The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
The first-quarter moon is at its highest point at about 6 P.M.
Answer the following statement true (T) or false (F)
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
A. 49 mJ B. 31 mJ C. 80 mJ D. 0.13 J E. 62 mJ
You are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. What force caused you to move forward?
A) force of gravity B) normal force due to your contact with the floor of the bus C) force due to static friction between you and the floor of the bus D) force due to kinetic friction between you and the floor of the bus E) no forces were responsible for your fall.