3. a. What is the direction of the magnetic force on a negative charge that moves as shown in each of the cases shown? Vout b. What is cross field? Provide an example? 4. Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles? O 2 20 O 5. In the figure, a small particle of charge -53x 10-6 C and mass m= 8 x 10- kg has speed vo= $ x 10' m/s as it enters a region of uniform magnetic field. The particle is initially traveling perpendicular to the magnetic field and is observed to travel in the semicircular path shown with radius R =-53/100 cm. Find the magnitude and direction of the magnetic field in the region. Region of magnetic field R Path of the particle