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Lec09-2

# Lec09-2 - ture 9-1 ture Capacitors Q Q Q-Q Q A capacitor is...

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cture 9- cture 9-1 Capacitors A capacitor is a device that is capable of storing electric charges and thus electric potential energy . => charging Its purpose is to release them later in a controlled way. => discharging Capacitors are used in vast majority of electrical and electronic devices. +Q - Q Q Q Q Typically made of two conductors and, when charged, each holds equal and opposite charges .

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cture 9- cture 9-2 DOCCAM 2 DEMO 5A-28 PARALLEL PLATE CAPACITOR
cture 9- cture 9-3 Polar and Nonpolar Dielectrics E ext = 0 : the orientations of the permanent electric dipoles are distributed randomly, so the net dipole moment of the material is zero . E ext > 0 : the molecular dipoles try to align themselves with the field against random thermal motion, resulting in a net dipole moment. Polar dielectrics: dielectric material whose molecules have permanent electric dipole moments, such as water. Nonpolar dielectrics: molecules with no permanent electric dipole moments. E ext > 0 : ± charges separate, induced dipole moment emerges.

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cture 9- cture 9-4 READING QUIZ 1 A capacitor C 0 with air dielectric κ =1 is charged to a potential V and then is disconnected from the battery. A uniform dielectric with dielectric constant κ > 1 is inserted into the capacitor and occupies the full volume of the capacitor. If the original electric field is E 0 and the final electric field is E κ , which of the following statements is correct.? A| E 0 = E κ B| E 0 < E κ C| E 0 > E κ D| E 0 = E κ / κ
cture 9- cture 9-5 Dielectrics between Capacitor Plates + + + + + - - - - - + Q - Q free charges neutral -q +q Electric field E between plates

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Lec09-2 - ture 9-1 ture Capacitors Q Q Q-Q Q A capacitor is...

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