Question

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.

Answer 1

it increases the magnetic field strength

Answer 2

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

`B = (\mu_0 N i)/(L)`

here we know that

`\mu_0` = 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

`B = (\mu_0 \mu_r N i)/(L)`

so correct answer will be

It increases the magnetic field’s strength.