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DAILY QUESTION March 24, 2009

DAILY QUESTION March 24, 2009. What is an electric field?. Agenda 3/24/09. Daily Question Ch 16 Section 1 Notes Electric force and electric fields Section 1 Vocabulary Squares Assignments: 1. Section 1 Vocabulary Squares due 3/25 2. Section 1 Review Worksheet due 3/25.

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DAILY QUESTION March 24, 2009

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  1. DAILY QUESTION March 24, 2009 • What is an electric field?

  2. Agenda 3/24/09 • Daily Question • Ch 16 Section 1 Notes • Electric force and electric fields • Section 1 Vocabulary Squares Assignments: 1. Section 1 Vocabulary Squares due 3/25 2. Section 1 Review Worksheet due 3/25

  3. Induced Charge • Charges move within uncharged objects • The charges in a neutral conductor can be redistributed without contacting a charged object • Bringing a negatively charged object close to a conductor will cause the electrons to move away from the object so the portion of the conductor nearest the charged object will have an excess of positive charges and the portion farthest will have an excess of negative charges • The total charge will still be zero!

  4. Electric force • The force of attraction or repulsion between objects due to charge • It is responsible for: • Clothes clinging to each other when you take them out of the dryer • Force of friction • Holding an atom together • Without the electric force, life itself would be impossible

  5. Electric Force • Depends on charge and distance. • The electric force between two objects is proportional to the product of the charges on the objects. • If the charge on one object is doubled, the electric force between the objects will be doubled

  6. And… • The electric force is inversely proportional to the square of the distance between two objects • If the distance between two small charges is doubled, the electric force between them decreases to one-fourth its original value • If the distance is quadrupled, the force decreases to one-sixteenth

  7. Electric force acts through a field • A charged particle produces an electric field in the space around it. • Another charged particle in that field will experience an electric force.

  8. One way to show an electric field is by drawing electric field lines • Electric field lines point in the direction of the electric force on a positive charge. • Because two positive charges repel one another, the electric field lines around a positive charge point outward • The electric field lines around a negative charge point inward • Regardless of the charge, electric field lines never cross one another

  9. Field lines not only show the direction of an electric field, • They also show the relative strength due to a given charge • More lines are drawn for greater charges to indicate greater force

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