Solved: A 0.80-m aluminum bar is held with its length
Chapter 22, Problem 22.57(choose chapter or problem)
A 0.80-m aluminum bar is held with its length parallel to the eastwest direction and dropped from a bridge. Just before the bar hits the river below, its speed is 22 m/s, and the emf induced across its length is 6.5 104 V. Assuming the horizontal component of the earths magnetic field at the location of the bar points directly north, (a) determine the magnitude of the horizontal component of the earths magnetic field, and (b) state whether the east end or the west end of the bar is positive.
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