Consider the system pictured in the figure below. A ℓ = 12-cm length of conductor of mass 29 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. Either end of a horizontal bar of length ℓ, shaped in a loop at each end, is threaded onto one of two thin, vertical, parallel conductors, forming an H shape. A current of 5.0 A flows counterclockwise through the bottom part of the H shape.

Consider the system pictured in the figure below. A ℓ = 12-cm length of conductor of mass 29 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. Either end of a horizontal bar of length ℓ, shaped in a loop at each end, is threaded onto one of two thin, vertical, parallel conductors, forming an H shape. A current of 5.0 A flows counterclockwise through the bottom part of the H shape.

magnitude	T
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