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PLEASE ANSWER ASAP!!
How does adding an iron bar to a solenoid affect the magnetic field of the electromagnet?

It changes the magnetic field to a current.
It changes the magnetic field’s direction.
It increases the magnetic field’s strength.
It decreases the magnetic field’s strength.

Respuesta :

it increases the magnetic field strength

As we know that magnetic field strength due to solenoid is given by

[tex]B = \frac{\mu_0 N i}{L}[/tex]

here we know that

[tex]\mu_0 [/tex] = permeability of air medium

N = number of turns

L = length of solenoid

i = electric current

Now as we enter the iron rod into the solenoid the medium will get change that will increase the permeability

so with the iron rod we will have

[tex]B = \frac{\mu_0 \mu_r N i}{L}[/tex]

so correct answer will be

It increases the magnetic field’s strength.

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