Lecture_02_(Chap.14)

Lecture_02_(Chap.14) - The Physical Concept of Field Field:...

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1 The Physical Concept of ‘Field’ Field: physical quantity, can be scalar or vector Examples: Temperature T(x,y,z,t) Gravitational field g m F = E q F = m q 2 0 1 ˆ 4 Q Er r πε =  2 ˆ M g Gr r = −  
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2 How Strong is the Coulomb Force eletron and proton
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3 A penny carrying a small amount of positive charge Q p exerts an electric force F on a nickel carrying a large amount of positive charge Q n that is a distance d away (Q n > Q p ). Which one of the following is not true? A. The electric force exerted on the penny by the nickel is also equal to F . B. The number of electrons in the penny is less than the number of protons in the penny. C. , if d is small compared to the size of the coins. D. , if d is large compared to the size of the coins. πε 0 pn 2 QQ 1 F= 4 d Question 1 (Chap. 14) 0 2 1 4 d
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4 Which one of the following is not true? The electric force exerted by an electron on an electron: A. decreases by a factor of 25 if the distance is increased by a factor of 5. B. has the same magnitude as the electric force exerted by a proton on a proton at the same distance. C. has the same direction as the electric force exerted by a proton on a proton at the same distance. D. is much weaker than the gravitational force between them. Question 2 (Chap. 14)
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5 The net electric field at a location in space is a vector sum of the individual electric fields contributed by all charged particles located elsewhere. The Superposition Principle The electric field contributed by a charged particle is unaffected by the presence of other charged particles.
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6 The Superposition Principle
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7 The E of a Uniformly Charged Sphere Can calculate using principle of superposition: r r Q E sphere ˆ 4 1 2 0 πε = for r>R (outside) 0 = sphere E for r<R (inside)
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8 Electric dipole: Two equally but oppositely charged point-like objects What is the E field far from the dipole (r>s)?
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This note was uploaded on 04/23/2011 for the course PHYS 272h taught by Professor Staff during the Spring '08 term at Purdue.

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Lecture_02_(Chap.14) - The Physical Concept of Field Field:...

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