Question

explain that a magnet has a certain magnetic field​

Answer 1

Answer:

It represents that the magnet exerts a force around its body with a stronger force near the two poles. Also, this regular pattern of the iron filings on the board represents the lines of magnetic field. Thus, a magnet has a certain magnetic field which can be represented by curved lines around a magnet

Answer 2

Two main types of phones are used in modern society: the analog-based, fixed-line telephone and the satellite-based, cellular phone. Fixed-line telephones were first established as a telecommunications network in the late 1800s using a complex system of wires placed around the world.