What determines the strength of the core of an electromagnet?

The strength of the core of an electromagnet primarily depends on two key factors: the number of turns of wire in the coil and the amount of current passing through the coil.

When more turns of wire are wrapped around the core, each loop of wire contributes to the overall magnetic field generated. By increasing the number of turns, the total magnetic field strength is amplified. Additionally, the amount of current flowing through the wire directly influences the strength of the electromagnet. According to Ampère's law, an increase in current leads to an increase in the magnetic field produced around the wire and within the core, effectively enhancing the overall magnetic strength of the electromagnet.

The combination of these two factors—number of turns and current—allows for precise control over the electromagnet's strength, making this answer the most comprehensive and accurate.