Chapter23 english

Chapter23 english - Chapter 23: Electric Field 23-3...

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lide 1 Fig 23CO, p.707 Chapter 23: Electric Field 23-3 Coulomb’s Law 23-4 Electric Field 23-6 Electric field lines 23-7 Motion of charged particles in a uniform electric field
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lide 2 INTRODUCTION
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lide 3 Fig 23-2, p.708
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lide 4 Fig 23-1, p.708 (a) Negatively charged rubber rod suspended by a thread is attracted to a positively charged glass rod. (b) (b) A negatively charged rubber rod is repelled by another negatively charged rubber rod.
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lide 5 Fig 23-4, p.710 Charging a metallic object by induction (that is, the two objects never touch each other). (a) A neutral metallic sphere, with equal numbers of positive and negative charges. (b) The electrons on the neutral sphere are redistributed when a charged rubber rod is placed near the sphere. (c) When the sphere is grounded, some of its electrons leave through the ground wire. (d) When the ground connection is removed, the sphere has excess positive charge that is nonuniformly distributed. (e) When the rod is removed, the remaining electrons redistribute uniformly and there is a net uniform distribution of positive charge on the sphere.
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lide 6 Fig 23-5a, p.710 (a) The charged object on the left induces a charge distribution on the surface of an insulator due to realignment of charges in the molecules.
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lide 7 Fig 23-5b, p.710
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lide 8 Table 23-1, p.712
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lide 9 Fig 23-7, p.713 Two point charges separated by a distance r exert a force on each other that is given by Coulomb’s law. The force F 21 exerted by q 2 on q 1 is equal in magnitude and opposite in direction to the force F 12 exerted by q 1 on q 2 . (a)When the charges are of the same sign, the force is repulsive. (b) (b) When the charges are of opposite signs, the force is attractive.
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lide 10 Fig 23-7a, p.713
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lide 11 Charles Coulomb French physicist (1736–1806) Coulomb’s experiments showed that the electric force between two stationary charged particles • is inversely proportional to the square of the separation r between the particles and directed along the line joining them; • is proportional to the product of the charges q 1 and q 2 on the two particles; • is attractive if the charges are of opposite sign and repulsive if the charges have the same sign.
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lide 12 The value of the Coulomb constant k e depends on the choice of units. The SI unit of charge is the coulomb (C). The Coulomb constant ke in SI units has the value k e = 8.9875 x10 9 N.m 2 /C 2 1 2 2 1 2 2 1 e F q q F r q q F k r r α = ur ur r
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lide 13 Using Newton’s law of gravitation
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Chapter23 english - Chapter 23: Electric Field 23-3...

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