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Electric Fields,Circuits Electric Fields; Emf,Currents,Potential Difference and Multiloop Circuits

Electric Fields,Circuits Electric Fields; Emf,Currents,Potential Difference and Multiloop Circuits. Lecture 21 Thursday: 1 April 2004. Coulomb’s Law. q. q o. Recall the Coulomb Force Problem on Two Charges.

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Electric Fields,Circuits Electric Fields; Emf,Currents,Potential Difference and Multiloop Circuits

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  1. Electric Fields,Circuits Electric Fields; Emf,Currents,Potential Difference and Multiloop Circuits Lecture 21 Thursday: 1 April 2004

  2. Coulomb’s Law

  3. q qo Recall the Coulomb Force Problem on Two Charges What is the force on q0 due to q if q= 2 C , qo = 3 C and the distance between them is 3 meters? How about if qo = 3 C ? How about if qo = 1.5 C? ….. Calculating the force exerted by qon any given charge you might place at the location of qo gets repetitive. The only thing that changes is the value of qo.

  4. The Electric Field • We define the electric field associated with a charge or charge distribution to be the electrostatic force exerted per unit of charge on which the force acts. • If we know E, the force, F, on any charge, qo, is then given by: • We can calculate E once and then get F for any charge easily.

  5. q qo The Electric Field • From a point charge q, the force on q0 is, • Then, at q0’s location, the field associated with q is • Field is a vector. The direction is away from a positive q and toward a negative q. It is also always in the direction of F on a positive charge.

  6. Example

  7. Example

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