Lecture_04_(Chap.15)

Lecture_04_(Chap.15) - Question 1 (Ch. 15) Which of the...

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Unformatted text preview: Question 1 (Ch. 15) Which of the following statements is true? A) A charged object is always repelled by a neutral object? B) A charged object is always attracted to a neutral object? C) A charged object is sometimes attracted and sometimes repelled by a neutral object? D) A charged object is not affected by a neutral object? Interaction of Charged Objects Repulsion: can happen only for like-charged objects! Attraction: can happen also for like-charged objects! q q q 2 1 1 2 2 r r N r F 4 4 5 1 2 2 1 Intervening matter does not block the E field he resulting field is a perposition f two fields: The resulting field is a superposition of two fields: Field of the other charge plus the field of induced dipoles. Conductors and Insulators Different materials respond differently to electric field Conductor : contains mobile charges that can move through material Insulator : contains no mobile charges Polarization of Insulators Insulator: Electrons are bound to the atoms or molecules. Electrons can shift slightly (<1 ), but remain bound to the molecule. dividual atoms or molecules can be Individual atoms or molecules can be polarized by external electric field. here are a lot of molecules e net There are a lot of molecules the net effect produced by the induced dipoles can be very large. Polarization of Insulators Diagram showing polarization of an insulator: Dipoles: exaggerated in size; stretch: degree of polarization No mobile charges: excess charges stay where they are Low Density Approximation...
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Lecture_04_(Chap.15) - Question 1 (Ch. 15) Which of the...

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