Quel est le principe de fonctionnement de ce stylo de test inductif et comment le comprendre ?
When you hold the negative terminal of the battery close to the live wire, the light will turn on. The schematic should be similar to the one in the picture. Why does the hand have to hold the negative pole to measure it? Another thing I don't understand is that when the tip of the induction pen is brought close to an object quickly, or an object is quickly brought close to the front of the electric pen, no matter what object is next to it, the light will be on, and the front end should be Coil, can it still generate an electric field in this way? . .
