1. Magnetic Force on a Proton. A magnetic field exerts a force of 8.0 x 10-14 N toward the west on a proton moving vertically upward at a speed of 5.0 x 106 m/s. When moving straight in a northerly direction, the force on the proton is zero. Determine the magnitude and direction of the magnetic field B in this region. (The charge of a proton = 1.6 x 10-19 C). V (up) + Moving into page (north) (west) 2. Magnetic force on a current-carrying wire. A wire carrying a steady (DC) 30-A current has length L =12 cm between the pole faces of a magnet. The wire is at angle 0=600 to the field. The magnetic field is approximately uniform at 0.90 T. We ignore the field beyond the pole pieces. Determine the magnitude and direction of the magnetic force on the wire. 0 = 60 cm 3. Faraday's Law: A loop of wire in a magnetic field. A square loop of wire of side L= 5.0 cm is in a uniform magnetic field B = 0.16 T. What is the magnetic flux in the loop (a) when the magnetic field B is perpendicular to the face of the loop and (b) when B is at an angle of 30 to the area of the loop? (c) What is the magnitude of the average current in the loop if it has a resistance of 0.0120 and it is rotated from position (b) to position (a) in 0.14 s