The figure shows a loop of wire carrying a current I = 10A. The sidelength of the wire loop is a = 8cm. What is the magnitude and direction of the magnetic field at point P? a/4 Y •P y ·x a

A solenoid 3.0 cm long consists of 9000 loops of wire. If the magnetic field inside the solenoid is measured as 1.0 T, what is the magnitude of the current that flows through it? a 0.037 A b 0.37 A c 2.65 A d 3.05 A e 0.58 A

In the figure, a conducting rod of length L= 25.0 cm moves in a magnetic field B → of magnitude 0.490 T directed into the plane of the figure. The rod moves with speed v = 4.00 m/s in the direction shown.  When the charges in the rod are in equilibrium, what is the magnitude E of the electric field within the rod? What is the magnitude Vba of the potential difference between the ends of the rod? What is the magnitude E of the motional emf induced in the rod?

A proton travelling at a high velocity enters a 0.45 T magnetic field and travels in a circular path of radius 0.28 m as shown. A B=0.45 T X X X X X X X X X X X B What is the kinetic energy of the proton? And which path will the proton follow? A or B? x X X X X