4. A teacher sprinkles some iron shavings on a clear tray. She places two magnets in the shavings with the north ends facing each other. (See the picture below here before move on) Based on the cause-and-effect relationship between the magnets, which phenomenon is the teacher modeling for her students? MS-PS2-3 a. electrical force
b. attractive force
c. field of repulsion
d. gravitational attraction