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Day 3: Electric Fields

Day 3: Electric Fields. Objectives. Static Electricity Electric Field Properties 1 & 2 –Dimensional Electric Field Calculations of Point Charges. Static Electricity. The electrostatic Force, like gravity, is a field force & is an inverse square law with the radial distance away

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Day 3: Electric Fields

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  1. Day 3: Electric Fields

  2. Objectives • Static Electricity • Electric Field Properties • 1 & 2 –Dimensional Electric Field Calculations of Point Charges

  3. Static Electricity • The electrostatic Force, like gravity, is a field force & is an inverse square law with the radial distance away • Michael Faraday (1791-1867) was the first to develop the idea of an electric field

  4. 21-6 The Electric Field • An electric field surrounds every point charge • It extends radially outward for positive (+) charges • It extends radially inward for negative (-) charges • The Electric Field felt at a point at some position P, away from the point charge is:

  5. 21-6 The Electric Field For a point charge:

  6. 21-6 The Electric Field • The Electric Field is a Vector Quantity • The net Electric Field at a point P due to the presence of multiple electric charges is the vector sum of the Electric Field generated by each charge: (Law of Superposition)

  7. 21-6 The Electric Field Example 21-7: E at a point between two charges. Two point charges are separated by a distance of 10.0 cm. One has a charge of -25 μC and the other +50 μC. (a) Determine the direction and magnitude of the electric field at a point P between the two charges that is 2.0 cm from the negative charge. (b) If an electron (mass = 9.11 x 10-31 kg) is placed at rest at P and then released, what will be its initial acceleration (direction and magnitude)?

  8. 21-6 The Electric Field Example 21-8: above two point charges. Calculate the total electric field (a) at point A and (b) at point B in the figure due to both charges, Q1 and Q2.

  9. 21-6 The Electric Field • Problem solving in electrostatics: electric forces and electric fields • Draw a diagram; show all charges, with signs, and electric fields and forces with directions. • Calculate forces using Coulomb’s law. • Add forces vectorially to get result. • Check your answer!

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