A positively charged particle moves through a uniform magnetic field. The animations show the field vectors (position is given in millimeters and time is given in seconds). Which animation is correct? Explain. Link for animations:

What is the radius of the circular path ofa charged particle in a magnetic field?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?

As the distance from a magnet increases, what happens to the magnet force?