51_Ch21B_CoulombsLaw_ Electric_Field

51_Ch21B_CoulombsLaw_ Electric_Field - Chapter 21 Electric...

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Chapter 21 Electric Field and Coulomb’s Law (again) Electric fields and forces (sec. 21.4) Electric field calculations (sec. 21.5) Vector addition (brief review) C 2009 J. Becker
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Learning Goals – In this chapter we will learn: • How to use Coulomb’s Law (and vector addition) to calculate the force between electric charges. • How to calculate the electric field caused by discrete electric charges. • How to calculate the electric field caused by a continuous distribution of electric charge.
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Coulomb’s Law Coulomb’s Law lets us calculate the FORCE between two ELECTRIC CHARGES.
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Coulomb’s Law Coulomb’s Law lets us calculate the force between MANY charges. We calculate the forces one at a time and ADD them AS VECTORS . (This is called “superposition.”) THE FORCE ON q 3 CAUSED BY q 1 AND q 2 .
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Figure 21.14
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Recall GRAVITATIONAL FIELD near Earth: F = G m 1 m 2 /r 2 = m 1 (G m 2 /r 2 ) = m 1 g where the vector g = 9.8 m/s 2 in the downward direction, and F = m g . ELECTRIC FIELD is obtained in a similar way: F = k q 1 q 2 /r 2 = q 1 ( k q 2 /r 2 ) = q 1 ( E ) where is vector E is the electric field caused by q 2 . The direction of the E field is determined by the direction of the F , or as you noticed in the lab , the E field lines are directed 2 2 2 2
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Fig. 21.15 A charged body creates an
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51_Ch21B_CoulombsLaw_ Electric_Field - Chapter 21 Electric...

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