Respuesta :
Generally dipoles will have fields that are proportional to the inverse cube of the distance from the dipole.
This means that if you were to measure the B field of a bar magnetic at some point then walk away such that you doubled your distance from the magnet, your new B field strength would be an eighth of the original B field strength.
The density of electric field lines at a point determines the strength of the electric field at that point. Similarly, the density of magnetic field lines at a point determines the strength of the magnetic field at that point. So, if the pattern of field lines of two systems are similar, the field strength will have the same dependence on the distance from the source point (r). Here, both electric and magnetic field lines follow the inverse square law. That is, the field strengths are proportional to 1/r^2. Therefore, the magnetic field will also rapidly decrease with distance from the bar magnet just like the electric field of a dipole.
If we put some iron filings on a piece of paper and then put a bar magnet under it, we can see the filings arrange themselves in the pattern of the magnetic field lines. In the regions where the magnetic field is stronger, more iron filings will collect. We see that the density is maximum at the poles and decreases rapidly as we move away from them. So, the variation of field strength with distance is consistent with our experience with magnets.
What is magnetic field ?
"The magnetic field is the area around a magnet in which the effect of magnetism is felt. We use the magnetic field as a tool to describe how the magnetic force is distributed in the space around and within something magnetic in nature."
What is electric field ?
"The electric field is defined mathematically as a vector field that can be associated with each point in space, the force per unit charge exerted on a positive test charge at rest at that point. The electric field is generated by the electric charge or by time-varying magnetic fields."
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