pk-ch17-1x - PHY 2054: Physics II PHY 2054: Physics II...

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PHY 2054: Physics II
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PHY 2054: Physics II Calculate the Electric Field at P Calculate the el. potential at P
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PHY 2054: Physics II q r q k V i = Point charge istribution of charges ) ( 2 ln 2 2 2 2 z R z d d l l k r k o i i - + = + + = = ε σ Distribution of charges Line charge at an edge Disc on an axis through the center
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PHY 2054: Class Quiz If 500 J of work are required to carry a charged particle between two points with a potential difference of 20V, the magnitude of the charge on the particle is: A. 0.040 C B. 12.5 C C. 20 C D. cannot be computed unless the path is given E. none of these
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Some old business: What is the electric field of a shell of a uniform spherical charge distribution? What is the potential for each of the above?
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PHY 2054: Physics II Some old business The potential of a uniform spherical E charge. Calculate electric field, integrate it to get the potential V V r R
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Two particles with charges Q and -Q are fixed at the vertices of an equilateral triangle with sides of length a. The work required to move a particle with charge q from the other vertex to the center of the line joining the fixed particles is: . 0 A. 0 B. kQq/a C. kQq/a 2 D. 2kQq/a E. 1.4kQq/a
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PHY 2054: Physics II a= 39 cm q 1 = 3.4pC q 2 = 6 pC E at the center? What is the potential at the center?
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Chapter 17 Current and Resistance
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Electric Current The current is the rate at which the charge flows through a surface Look at the charges flowing perpendicularly through a surface of area A The SI unit of current is Ampere (A) 1 A = 1 C/s av Q I t
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pk-ch17-1x - PHY 2054: Physics II PHY 2054: Physics II...

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