1. Electric Motors: The heart of an electric motor is an electromagnet. When electricity flows through the electromagnet, it creates a magnetic field that interacts with a permanent magnet. This interaction causes the motor's shaft to rotate.

2. Hard Drives: Hard drives store data magnetically. Electromagnets are used to write data onto the spinning platter of the hard drive by altering the magnetic orientation of tiny particles on the platter's surface. Reading the data involves using another electromagnet to detect the magnetic orientation of these particles.

3. Magnetic Resonance Imaging (MRI) Machines: MRIs use powerful electromagnets to generate a strong magnetic field that aligns the nuclei of atoms in the body. By then applying radio waves, the machine can create detailed images of the internal structures of the body.