Consider a toroidal coil, which is essentially a solenoid bent into a circle. The field created by such a coil is
A. unidirectional.
B. circular.
C. axial.
D. None of the above.
B. circular.
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What do you call the first day of spring?
A. Vernal Equinox B. Solstice C. New Moon D. June 21 E. Autumn
You want to insert an aluminum rod, which at 20°C has a radius of 1.00020 cm into a copper tube which has a radius of 1.00010 cm at the same temperature
You decide to put both of them in the refrigerator. At what temperature will the rod just fit if both are cooled to the same temperature? The coefficient of thermal expansion for aluminum is 2.4 × 10-5K-1, and that of copper is 1.7 × 10-5K-1. A) 7.8°C B) 6.3°C C) 9.2°C D) 14.7°C E) 5.7°C
During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because
a. all heavy nuclei are unstable. b. no stable nuclei exist with masses of 5 or 8 hydrogen masses. c. the helium nucleus is unstable. d. the temperature and density were too low. e. no nuclei heavier than helium could form since there weren't any electrons formed.
The composition of Earth's atmosphere has not changed since its formation.
Answer the following statement true (T) or false (F)