Answer:
We can increase the strength by increasing current in the wire or increasing the number of turns of the coil around an iron core .
Explanation:
The magnetic strength due to current carrying conductor carrying current I and having N number of turns is given by
B = [tex]\mu _{0}\times N\times I[/tex]
[tex]\mu_{O}[/tex] is vacuum permeability .and its value is equal to [tex]4\pi\times10^{-7} \frac{H}{m}[/tex]
.so from the above equation we can see that magnetic strength is directly proportional to the current through wire and no. of turns .
