Test \"Magnetic Field\" Why does a constant magnetic field not change the speed of a charged particle? (1K, 1C) An electron moves horizontally to the east through a magnetic field directed downward. What is the direction of the force on the electron? Sketch a diagram. (1K, 1C) A wire 60 cm long carries a current of 10 A, running east through a uniform magnetic field. The wire experiences a force of 1 N [N]. What is the magnitude and direction of the magnetic field? Sketch a diagram. (3A, 1C) To create a beam of charged particles with a speed of 1.0x106 m/s, crossed electric and magnetic fields are used. If the magnetic field strength is 2.0x10'2 T, what must be the magnitude ofthe electric field? Sketch a diagram. (3A, 1C) A proton travels horizontally at a speed of 8.0x10'5 m/s and enters a magnetic field of strength 3.0x10'1T which is directed vertically upward. 3. Calculate the radius of orbit of the proton, and the time required to complete one orbit. (4A) b. If the velocity of the proton is directed into the page, what is the direction of the force exerted on the proton by the magnetic field? Sketch a diagram. (1K, 1C)