With my comprehensive skill set in electrical engineering, electronics design, and engineering development, I am well-positioned to deliver the compact and battery-powered magnetic coil you are seeking for your educational demonstration. Drawing from my vast knowledge in electromagnetics, I can create a device that effectively repels lightweight metals such as needles giving the desired 'floating' effect.
Over the years, I have honed my ability to design and create unique, reliable, and portable devices like the one we envision for your project. Additionally, my previous experiences in creating educational tools and demonstrations equip me with a deep understanding of the specific requirements for such projects.