To build an electromagnet capable of lifting up to 3 kg using 26 gauge copper wire and a 12V battery, it is essential to consider the solenoid's design for efficiency. A solenoid may not be the best choice for lifting weights due to its inherent inefficiencies. For optimal performance, the magnetic path should be closed, which can be achieved by ensuring both poles are presented simultaneously on the same plane and by using a ferrous metal piece to connect the poles. This configuration enhances the magnetic field strength, improving the electromagnet's lifting capability.
