When we make an observation of a distant galaxy 10 billion light-years away, we are seeing this galaxy as it
A) is right now
B) was when the universe was only 10 billion years old
C) was when the universe was formed
D) will be in 10 billion year's time
D
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Faraday's Law: A flat circular coil having 16 turns, each of diameter 20 cm, is in a uniform and steady 0.13-T magnetic field.(a) Find the total magnetic flux through the coil when the field is perpendicular to the plane of the coil.(b) If the coil is rotated in 10 ms so its plane is parallel to the field, find the average induced emf in the coil.
What will be an ideal response?
Materials generally become warmer when light is
A) absorbed by them. B) reflected by them. C) transmitted by them. D) all of the above E) none of the above
A mass spectrometer separates
A) ions of different elements. B) different-mass ions of the same element. C) different-mass ions of the same speed. D) all of the above E) none of the above
A charged comb attracts bits of neutral dust in the air. This happens because
A. the dust becomes polarized. B. the dust is a good conductor. C. the dust becomes charged by induction. D. the dust grounds the comb.