Question

And electromagnet is in temporary magnet made by Coiling wire around an iron core which becomes a magnet win and electric current flows through the wire how could a strength of an electromagnet be increase

Answer 1

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 = $\mu _{0}\times N\times I$

$\mu_{O}$ is vacuum permeability .and its value is equal to $4\pi\times10^{-7} \frac{H}{m}$

.so from the above equation we can see that magnetic strength is directly proportional to the current through wire and no. of turns .