Activity: What's the problem? DIRECTIONS: Solve the problems below using GRFSA. Box your final answer with two decimal places and DATE the correct unit. Do it at the back of this page. Problem 1: Calculating Magnetic Force on a Current-Carrying Wire: A Strong Magnetic Field Calculate the force on the wire shown on the figure, given B=1.50 T, L=5.00 cm, and I=20.0 A. Problem 2: Magnetic force on a proton A proton having a speed of 5.0 x 106 m/s in a magnetic field feels a force of 8.0 x 10-14 N toward the west when it moves vertically upward (see Fig. at the left). When moving horizontally in a northerly direction, it feels zero force (see Fig, b). Determine the magnitude and direction of the magnetic field in this region. (The charge on a proton is q = te = 1.6 x 10-19 (). Problem 3: Electron's path in a uniform magnetic field An electron travels at 2. 0 x 107m/s in a plane perpendicular to a uniform 0.010 T magnetic field. Describe its path quantitatively. (Mass of an electron is 9. 1 x 10-31 /g, the charge in an electron is 1.6 x 10-19 C.)