Respuesta :
A simple electromagnet consisting of a coil of insulated wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field created. The strength of magnetic field generated is proportional to the amount of current through the winding.
Answer:
It is used to increase the magnetic field intensity produce by the electromagnet
Explanation:
As we know that the magnetic field produced by the electromagnet is given by the formula
[tex]B = \mu_0 ni[/tex]
here we know that
[tex]\mu_0[/tex] = permeability of the free space
n = number of turns per unit length
i = electric current
so here we can say that if the permeability of medium is increased then the intensity of magnetic field will also increase
So we can use metal core to increase the field intensity produced by electromagnet
