Charging a metal ball by induction. Electron Electron buildup Metal deficiency Negatively charged rod ball - Wire Insulating stand Negative charge in ground Ground (a) Uncharged metal ball (b) Negative charge on rod repels electrons, creating zones of negative and positive induced charge. (c) Wire lets electron build- up (induced negative charge) flow into ground. (d) Wire removed; ball now has only an electron- deficient region of positive charge. (e) Rod removed; electrons rearrange themselves, ball has overall electron deficiency (net positive charge).

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.