The square coil is composed of wires, coil formers and wiring forks.Perfect experimental equipment for showing the phenomenon of electromagnetics or electromagnetic induction. Demonstrate the Oersted experiment, the magnetic field and electric induction of electric current in middle school physics teaching A simple and practical teaching and experiment equipment in middle schools. Also suitable tools for school teaching, learning and display collectibles, will be an important complement of laboratory materials. Don't hit or press hard to prevent damage to the instrument and affect the experimental results. High- quality material and fine craftsmanship, durable and sturdy for a long time. Incredible support tool that can be used in laboratory equipment for physical or lab decoration for enhancing the effectiveness of learning physics experiments. PURPOSE: Demonstrated in the middle school physics teaching the Oersted experiment, namely the magnetic field and electric induction of electric current.The square coil is composed of wires, coil formers and wiring forks. HOW TO USE: Place the magnetic needle on the plane, and place the square coil on the magnetic needle. Use the square bracket to fix the square coil and adjust the distance from the magnetic needle. Then connect the DC low-voltage power supply to the terminal and turn on the power supply. The magnetic needle will deflect.Cut off the power and the magnetic needle returns to its position. Experiments show that there is a magnetic field around the energized wire, just like a magnet. The magnetic needle is deflected by the magnetic field generated by the current. MATTERS NEEDING ATTENTION: 1. Do not bump or press hard to prevent damage to the instrument and affect the experimental results. 2. Effective environmental conditions: relative humidity is not more than 80% (4