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Physics Test 2

# Physics Test 2 - Physics Test 2 Ch 17 Electrostatic force...

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Physics Test 2 Ch. 17 Electrostatic force between any two charges is conservative since the dependence is on position just like gravitational force which is conservative. Electric potential energy is transformed into kinetic energy, and the total energy is conserved. Positive charge q has its greatest potential energy at point a, near the positive plate, the reverse is true for a negative charge: its potential energy is greatest near the negative plate. The greater the height of a cliff the more potential energy the rock has at the top of the cliff, relative to the bottom, and the more kinetic energy it will have when it reaches the bottom. The same can be said for charges between two plates o Electric charges come in two types, + and -, where gravitational mass is always +. Batteries maintain a potential difference. A capacitor is a device that can store electric charge and consisits of tow conduction objects (usually plates or sheets) placed near each other but not touching. Capacitors store charge which can later be released, as in a camera flash. Capacitors block surges of charge and energy to protect circuits.

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If a voltage is applied across a capacitor by connecting the capacitor to a battery with conducting wires, the two plates quickly become charged: one plate acquires a negative charge, the other an equal amount of positive charge. Each battery terminal and the plate of the capacitor connected to it are at the same potential; the full battery voltage appears across the capacitor. o Q=CV Value of C depends only on size, shape and relative position of the two conductors, and also on the material that separates them. o C= ε ʹ 0 A/d (parallel plate capacitor) Dielectric: an insulating sheet of material between the plates of a capacitor o C = Kε 0 A/d o ε = Kε 0 Called the permittivity of the material
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Physics Test 2 - Physics Test 2 Ch 17 Electrostatic force...

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