The Shock That Started It All
⚡ The Shock That Started It All
All matter is made of atoms. Atoms contain protons (positive) in the nucleus and electrons (negative) orbiting outside. Normally, an object has equal numbers of protons and electrons, so it is electrically neutral.
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🧠 Memory Aids
LIUR — Like and Unlike Charges:
Like charges — I push away (repel) | Unlike charges — Rush together (attract)
LIUR = Like Repel, Unlike Attract
The "only electrons move" trick:
Think of the nucleus as a locked vault — protons are inside and can't get out. Only electrons are on the outside, free to move. When you rub two materials together, electrons are the only thing that can transfer.
Field line direction — the "positive tourist" trick:
Imagine a tiny positive tourist dropped into the electric field. Which way would they travel? They'd be repelled from positive charges and attracted to negative ones. The arrows on field lines show exactly where the tourist would go.
Lightning conductor — "the pointed path":
A pointed conductor has the strongest electric field at its tip. Think of it as the easiest exit for charge — like a drain in a bathtub. Charge leaks away continuously and gently through the point, instead of building up to a violent lightning strike.
Now try it yourself
Quiz · Question 1 of 15
When a plastic rod is rubbed with a cloth, the rod becomes negatively charged. Which statement best explains why?
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