Chap24_PHY2049

Chap24_PHY2049 - Chapter 24 – Capacitance and Dielectrics...

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Unformatted text preview: Chapter 24 – Capacitance and Dielectrics- Capacitors and capacitance- Capacitors in series and parallel- Energy storage in capacitors and electric field energy- Dielectrics- Molecular model of induced charge- Gauss law in dielectrics 1. Capacitors and Capacitance Capacitor: device that stores electric potential energy and electric charge. - Two conductors separated by an insulator form a capacitor. - The net charge on a capacitor is zero. - To charge a capacitor -| |-, wires are connected to the opposite sides of a battery. The battery is disconnected once the charges Q and –Q are established on the conductors. This gives a fixed potential difference V ab = voltage of battery. Capacitance: constant equal to the ratio of the charge on each conductor to the potential difference between them. ab V Q C = Units: 1 Farad (F) = Q/V = C 2 /J = C 2 /N m- Capacitance is a measurement of the ability of capacitor to store energy (V = U / q). Capacitors in Vacuum- Parallel Plate Capacitor: uniform electric field between the plates, charge uniformly distributed over opposite surfaces A Q E o o ε ε σ = = d A V Q C ab ε = = A Qd d E V o ab ε 1 = ⋅ = ε = 8.85 x 10-12 F/m- The capacitance depends only on the geometry of the capacitor.- The capacitance depends only on the geometry of the capacitor....
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Chap24_PHY2049 - Chapter 24 – Capacitance and Dielectrics...

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