How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (?0 = 4? × 10-7 T ? m/A)
A) 80 A B) 22 A C) 13 A D) 0.013 A E) 40 A
A
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Exclusion Principle: The elements in the periodic table that have completely filled shells or subshells are referred to as
A. noble gases. B. halogens. C. alkali metals. D. transition elements.
The presence of ________ planets orbiting it shows us the Sun belongs to Population I
Fill in the blank(s) with correct word
The change in entropy of a mass m of a solid substance which has a latent heat of fusion LF and melts at a temperature T is
a. LFT/m b. mLF ln(T) c. mLFT d. mLF/T e. LF/mT
This figure shows an all-sky map of the cosmic microwave background recorded by the Planck mission. What do the dark and bright variations represent?
A) regions of the sky with very slightly different density at the time the radiation was emitted B) regions of the sky with different proportions of hydrogen and helium at the time the radiation was emitted C) the present distribution of galaxies in the universe D) regions of the sky with different amounts of dark energy