Why are force fields used to describe magnetic force?

The force fields are used to describe the movement of particles caused by a magnetic force.

Explanation

Magnetic forces can cause attraction or repulsion depending on the effect caused by the movement of particles.  

The magnetic force fields are imaginative lines surrounding the object where the magnetic force is applied.

The number of field lines determines the strength of the magnetic field and the tangent at the curve determines the direction of the field.

The direction of the magnetic force can be figured by right-hand thumb rule.

Like forces always repels while unlike forces always attracts.

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.