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An object that does not allow electricity to flow is called an insulator.
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When an ebonite rod is rubbed with fur, the rod becomes negative and the fur becomes positive.
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An object with 4 positive charges and 3 negative charges is electrically neutral.
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A copper wire is an example of a poor conductor.
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The only type of subatomic particles that can travel along a wire carrying electricity are protons.
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| True / False |
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Unlike covalent solutions (like kerosene), ionic solutions (like salt water) can conduct electricity.
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Oppositely charged objects repel each other whereas similarly charged objects attract each other.
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When a positively charged glass rod is brought close to a neutral pithball, the pithball is attracted to the glass rod.
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When a positively charged glass rod is touched to a neutral pithball, the pithball becomes positively charged.
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When a negatively charged ebonite rod touches a neutral pithball, the pithball becomes negative and the rod becomes positive.
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| True / False |
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When an object is used to charge a neutral pithball by touching it, we say the pithball has been charged by "Induction".
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When a negatively charged ebonite rod is brought close to a neutral metal leaf electroscope, electrons are attracted and travel from the leaves to the sphere at the top of the electroscope.
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When a wire is attached to the neck of a neutral metal leaf electroscope and a positive glass rod is brought close, electrons are repelled out of the electroscope down the wire.
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The leaves of a metal leaf electroscope diverge when they have the same charge.
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You can only get a shock after touching a metal object if excess electrons exit your body.
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| True / False |
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The bottom of a thundercloud is usually negatively charged which induces a positive charge on the ground below it. If the charge separation becomes great enough, a large discharge occurs as lightning.
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When a lightning discharge occurs it heats up molecules in the air which then move about rapidly and collide causing the sound of thunder.
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A lightning rod safely carries the electricity in a lightning bolt into the earth because the lightning rod is a very good conductor. This is called "Grounding".
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The sound of thunder comes before the associated lightning discharge because sound travels faster than light.
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When you rub a balloon on your hair, the balloon gains a negative charge. If you place the balloon on a wall, a positive charge is induced on the wall and the balloon and wall now attract causing the balloon to stick.
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