What methods can enhance the magnetic action of a coil with current?

The more turns the coil has, the stronger the magnetic effect.
The higher the current passing through the coil, the stronger the magnetic effect.
Strengthen the action of the coil by placing an iron rod (core) in it.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.