6. How did a change in voltage affect the use of an electromagnet?

A change in voltage can significantly affect the use of an electromagnet. An electromagnet is a type of magnet where the magnetic field is produced by an electric current. The strength of the magnetic field generated by an electromagnet is directly proportional to the current flowing through its coil. Voltage, according to Ohm's Law (V = I * R, where V is voltage, I is current, and R is resistance), is a factor that influences the current. Therefore, any change in voltage, assuming resistance remains constant, will change the current flowing through the electromagnet, thereby affecting its magnetic field strength.

When the voltage increases, and the resistance of the coil does not change, more current will flow through the electromagnet. This increase in current will enhance the strength of the magnetic field. Conversely, if the voltage decreases, less current will pass through the coil, resulting in a weaker magnetic field.

Also, it's worth noting that very high voltages can lead to the production of excessively high currents, which could cause the electromagnet to overheat and potentially get damaged. So, the alteration of voltage in an electromagnet must be done considering the limitations and specifications of the materials involved in the coil, such as the wire's resistance and its thermal capacity.