Question

@#$&

以下節錄自《費曼物理學講義》：
If we were to charge a body, say a comb, electrically, and then place a charged piece of paper at a distance and move the comb back and forth, the paper will respond by always pointing to the comb. If we shake it faster, it will be discovered that the paper is a little behind, there is a delay in the action. (At the first stage, when we move the comb rather slowly, we find a complication which is magnetism. Magnetic influences have to do with charges in relative motion, so magnetic forces and electric forces can really be attributed to one field, as two different aspects of exactly the same thing. A changing electric field cannot exist without magnetism.) If we move the charged paper farther out, the delay is greater. Then an interesting thing is observed. Although the forces between two charged objects should go inversely as the square of the distance, it is found, when we shake a charge, that the influence extends very much farther out than we would guess at first sight. That is, the effect falls off more slowly than the inverse square.
請問為什麽作用力的衰退會比平方反比緩慢得多？

Answer 1

白膠

可能因為電力的平方反比定律不足以解釋震盪的行為（？這段後面有引入一段說明 可以去看看

@#$&

有看到了，但這樣會違背電場的公式（r向量）* kq/r³嗎