Bcoz when you place a magnet close enough the magnet attracts or repals without any other fore we dont touch the magnet so it is non contact
The particles are either being absorbed or evaporating
Https://www.physicsclassroom.com/class/refrn/Lesson-2/The-Angle-of-Refraction
Not be as fast as if the radius were smaller. Why? Because the closer you are to the magnetic field, the stronger the gravitational pull on the object would be.