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Section 2-1

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Objectives N.2.1.1. Explain how electric charges interact. N.2.1.2. Explain what an electric field is. N.2.1.3. Describe how static electricity builds up and transfers.

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Electric Charge Charges that are the same repel each other and charges that are different attract each other. N.2.1.1. Sound familiar? Magnetic poles follow the same rules.

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Electric Force Electric Force is the attraction of repulsion between electrically charges particles. An electric field is the region around a charges particle where electric force is exerted on other charged particles. Objective N.2.1.2. Sound familiar? Just like magnetic fields!!!

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Electric Fields Around Single Charges The electric field from a positive charge point outward while the electric field from a negative charge points inward.

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Electric Fields Around Multiple Charges When two charges are brought close to each other, their electric fields are combined.

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Combined Electric Fields OppositeLikes

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Combined Electric Fields: Cool Picture

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Static Electricity Static means not moving so, in static electricity charges build up on an object but they do not flow. Objective N.2.1.3.

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Transferring Charge There are three methods for transferring charge from on object to another: Friction Conduction Induction

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Friction Friction is the transfer of electrons by rubbing objects together.

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Conduction Conduction is the transfer of electrons by two objects touching. Sound familiar? Heat can also be transferred by conduction.

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Induction When a charged object is brought close to another object, the charges separate by induction. The objects dont need to touch.

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Static Discharge When a negatively charged object and a positively charged object are brought close together, electrons may transfer until both objects have the same charge again. Objective N.2.1.3.

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Lightning

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Lightning is the most dramatic natural form of static discharge. Trillions upon trillions of electrons suddenly jump from the cloud base to the ground.

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Lightning

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