7. [-5 Points] DETAILS OSUNIPHYS1 28.2.WA.007. MY NOTES Using appropriate technology, you determine that the Earth's magnetic field at your location has a magnitude of 5.20 x 10'5 T and is directed north at an angle of 56 below the horizontal. You charge a metallic projectile and fire it north with a speed of 630 m/s and at an angle of 14" above the horizontal. Determine the sign (+ or ) and charge of the projectile, if the magnetic force on the projectile is 3.20 X 10'10 N, directed due west. :C Submit Answer 8. [-I2 Points] DETAILS OSUNIPHYS1 28.2.WA.009. MY NOTES A proton moving in the positive x direction with a speed of 8.7 x 105 m/s experiences zero magnetic force. When it moves in the positive y direction it experiences a force of 1.9 x 10'13 N that points in the positive 2 direction. Determine the magnitude and direction of the magnetic eld. magnitude :] T direction m 9. [-I3 Points] DETAILS SERPSEWA10 28.WA.013. MY NOTES A proton enters a region of constant magnetic field, perpendicular to the eld and after being accelerated from rest by an electric field through an electrical potential difference of 320 V. Determine the magnitude of the magnetic eld, if the proton travels in a circular path with a radius of 15 cm. :lmT