An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole.
b. The nail becomes a north pole or a south pole.
c. The magnet exerts an attractive force on the nail.
d. The nail exerts an attractive force on the magnet.
e. The nail is ferromagnetic.
b
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Current: A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet. He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit 0.20 g of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol)
A. 9.1 mA B. 540 mA C. 33 A D. 1800 mA
A thin rod is pivoted around its end, and an identical rod around its center. If they are to have the same rotational kinetic energy, then 
A. 2 B. 1 C. 1/2 D. 1/4 E. 4
A horizontal metal bar rotates at a constant angular velocity w about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The emf induced between the two ends of the bar is
A) constant and proportional to the product B ?. B) constant and proportional to the product B ?2. C) constant and proportional to the product B2 ?2. D) variable with a maximum of B ?. E) variable with a maximum of B ?2.
When we glimpse the chromosphere at the start and end of totality, its color is:
A) green (the famous flash). B) yellow, like the photosphere below it. C) red, due to ionized hydrogen at lower pressure. D) blue, due to the ionization of nitrogen by the magnetic fields. E) white from the moonlight.