Determine the direction of the magnetic force acting on the proton or electron in each situation below.
A.
![](/old/images/magneticforce.gif)
B.
![](/old/images/magneticforce1.gif)
The picture below depicts a wire carrying a current I = 25.0 A. The shape of the wire is two combined arcs with r1 = 9.0 cm and r2 = 6.0 cm. Find the magnetic field at the center of the arcs (in blue).
![](/old/images/magneticdipole.gif)