9) An electron is moving toward a two-proton system, as shown in the given figure. Point M lies exactly between the two protons. Proton Electron M Proton At point M, the electron will (A) stop moving (B) get deflected left (C) get deflected right (D) experience no force15) Two 0.50 m long wires are parallel to one another. The electrical current travelling through one wire is equal and opposite in direction to the current travelling through the other. The two wires will experience (A) a repulsion force because the magnetic fields between the wires are in the same direction (B) an attraction force because the magnetic fields between the two wires are in the same direction (C) a repulsion force because the magnetic fields between the two wires is weaker than the magnetic fields outside the two wires (D) an attraction force because the magnetic fields between the two wires is weaker than the magnetic fields outside the two wires18) In a cathode ray tube experiment, electrons pass through perpendicular electric and magnetic fields without deflection. Which of the following properties of the electron can be calculated if only the strength of each field is known? (A) Mass (B) Speed (C) Charge (D) Charge-to-mass ratio19) V DO X E B A proton moving at 2.9 x 10"m /s enters a region in which perpendicular electric and magnetic fields exist, as shown in the given diagram. The magnitude of the electric field is 5.0 x 10*N /C. If the proton passes undeflected through this region, then the magnitude of the magnetic field is T. (Assume that gravity is negligible.)17) An electron with a velocity of 4.0 x 10 m/s due west enters into a uniform magnetic field of 5.0 mT directed down. What will be the radius and the orientation of the electron's circular path? (A) 4.6 mm on the horizontal plane (B) 4.6 mm on the vertical plane (C) 4.6 m on the horizontal plane (D) 4.6 m on the vertical plane