Question

PLEASE ANSWER ASAP!!

Answer 1

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

$B = \frac{\mu_0 N i}{L}$

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

$B = \frac{\mu_0 \mu_r N i}{L}$

so correct answer will be

It increases the magnetic field’s strength.

Answer 2

It increases the magnetic field strength