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# Electric Fields

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### Electric Fields

1. 1. Electric Fields
2. 2. Electric Field Electric fields are said to exist in the area near CHARGED objects. A charged object in an electric field experiences ELECTROSTATIC FORCE <ul><li>The amount of force depends on: </li></ul><ul><li>Strength of the field (E) </li></ul><ul><li>Charge on the object (q) </li></ul><ul><li>F = Eq </li></ul>
3. 3. Example <ul><li>An object with a charge of -2 coulombs positioned in a uniform electric field experiences a force of -300 newtons. What is the strength of the electric field? </li></ul><ul><ul><ul><ul><ul><li>E= F/q </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><li>E = -300 N / -2 C </li></ul></ul></ul></ul><ul><ul><ul><ul><li>E = 150 N/C </li></ul></ul></ul></ul>Unit for electric field strength is Newton per Coulomb
4. 4. Example <ul><li>What is the force experienced by a 0.05 coulomb charge when it is placed in an electric field with a strength of 3 x 10 3 newtons per coulomb? </li></ul><ul><ul><ul><ul><ul><li>F = Eq </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><li>E = (3 x 10 3 N/C)(0.03 C) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>E = 90 N </li></ul></ul></ul></ul>
5. 5. Electric Field Maps Electric field lines can be mapped using a POSITIVE test charge <ul><li>Place the test charge near the object </li></ul><ul><li>2. Decide which direction the charge will move </li></ul><ul><li>3. Draw a field vector in the direction of motion </li></ul>
6. 6. Area around a POSITIVE charge + + - + Area around a NEGATIVE charge Field lines point: OUTWARD from + INWARD toward -
7. 7. Electric Field Mapping + - Field lines NEVER CROSS +
8. 8. Electric Field Mapping + +