15.0 cm 5.00 A 5.00 A 5.00 A Figure P28.26

A conductive wire is arranged on the surface of the cube whose sides are 40 cm as shown. The wire is in the same magnetic field B = 0.02 T j. If the conductor is energized by an electric current I = 4 A in the direction shown in the picture, determine the vector of the magnetic force experienced by each piece of wire.

Consider the system pictured in the figure below. A 15.7-cm horizontal wire of mass 15.1 g is placed between two thin, vertical conductors, and a uniform magnetic field acts perpendicular to the page. The wire is free to move vertically without friction on the two vertical conductors. When a 5.20-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? (Select all that apply.) O electric force O gravitational force O magnetic force (b) Under what condition is the wire able to move upward at constant velocity? (c) Find the magnitude and direction of the minimum magnetic field required to move the wire at constant speed. magnitude direction ---Select--- (d) What happens if the magnetic field exceeds this minimum value?

A single rectangular loop of area 3.14 m2 carries a current of 10.0 mA.  It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as shown in the figure. The current is clockwise in the loop. (a) What is the magnitude of the torque exerted on the loop by the magnetic field? (b) Describe how the loop would rotate, such as which side could move out of page, you can draw the directions...show your reasoning steps. e.g. which rule you use.