How can one experimentally show that the direction of magnetic lines is related to the direction of current?

When the direction of the current in the conductor is reversed, the magnetic arrows rotate 180 °, this demonstrates that the direction of the magnetic lines is related to the direction of the current.

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.