Question

does the magnetic field always decrease with distance its not the same with electric field i heard ?

Answer 1

magnetic and electric fields both decrease with distance... they can both be measured as waves & lose energy over time and distance.... in a vacuum the loses are less but still do happen... typically losses as heat/friction ....

Answer 2

It's also important to consider what kind of system produce the magnetic or electric field, or even both. If the system is a single charge, a dipole, or an antenna, the field decrease with a different order of magnitude. But what you heard is a nonsense.

Answer 3

i am sorry i should have been brief it was given for infinetly long plane

Answer 4

For an infinitely plane (not a infinitely tape), the electric field is perpendicular to the plane, and depending on which side one takes, is either positive or negative constant. The value of the constant is :
\[\pm \sigma/2.\epsilon _{0}\]
If there's no movement of any electrical charges, there is no magnetic field. However, whether there's mouvement of charges, it's another question.

Answer 5

Relativistically, the only difference between electric and magnetic fields is the reference frame.