雷鸣电闪时,强大的电流使天空发出耀眼的闪光,但它只能存在于一瞬间,而手电筒中的小灯泡却能持续发光。这是为什么?这还要从导体中的电场谈起。当有带电体存在时,其周围就伴随有一个电场,电场的基本性质是对放入其中的电荷产生力的作用,因此物理学上把放入电场中某点的电荷所受的静电力F跟它的电量Q的比值叫做该点的电场强度E;而电场中某点正电荷所受静电力方向规定为该点的电场强度方向,按照这个规定,负电荷在电场中某点所受的静 Thunder flash, the powerful current sky flashing light, but it can only exist in a flashlight, while the small light bulb in the flashlight can continue to shine. This is why? This also from the electric field in the conductor to talk about. When a charged body is present, there is an electric field around it. The basic nature of the electric field is to exert a force on the charge placed in it. Therefore, the electrostatic force F With its power Q is called the electric field intensity E; and the electric field in a point of positive charge by the direction of electrostatic force is specified as the direction of the electric field strength at this point, according to this rule, the negative charge at a point in the electric field suffered Static