Final answer:
A magnetic field, or B-field, is where a magnetic force is felt, defined by the force on moving charges, and represented by concentric circles around a current-carrying wire. Maximum field strength denotes the highest amplitude for an electromagnetic wave's electric and magnetic forces.
Step-by-step explanation:
A magnetic field, denoted as B-field, is a region where a magnetic force can be detected. This field is characterized by magnetic field lines that form concentric circles around a current-carrying wire and can be described using the right-hand rule.
For a moving charged particle, the magnetic force experienced is proportional to the charge, velocity, and strength of the magnetic field. This relationship is captured in the formula for the magnetic field strength B, which is the cross product of the charge's velocity vector and the magnetic field vector. Therefore, the maximum field strength refers to the largest amplitude an electromagnetic wave can have, indicating the highest level of electric and magnetic force exerted by the wave.