Question

how did the size of the current in the coil affect the strength of the electromagnet

Answer 1

(1)The magnetic field is caused by the current flowing in the wire.

(2) The bigger the current the stronger the magnetic field and hence the stronger the electromagnet.

$B=\mu_0H$

$H=\frac{Ni}{L}$

$B=\frac{\mu_0Ni}{L}$

B High

Then I High