Consider the system
pictured in Figure P19.31.
A 15 - cm length of conductor
of mass 15 g, free to
move vertically, is placed
between two thin, vertical
conductors, and a uniform
magnetic field acts perpendicular
to the page. When a
5.0 - A current is directed as
shown in the figure, the horizontal
wire moves upward at
constant velocity in the presence
of gravity. (a) What forces act on the horizontal wire, and
under what condition is the wire able to move upward at constant
velocity? (b) Find the magnitude and direction of the
minimum magnetic field required to move the wire at constant
speed. (c) What happens if the magnetic field exceeds
this minimum value? (The wire slides without friction on the
two vertical conductors.)
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