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

Physics & Space Science

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A. 9.1 mA B. 540 mA C. 33 A D. 1800 mA

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When we glimpse the chromosphere at the start and end of totality, its color is:

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Physics & Space Science

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.

Physics & Space Science