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College Physics II

by: Dr. Baby Lebsack

College Physics II PHSX 115

Marketplace > Kansas > Physics 2 > PHSX 115 > College Physics II
Dr. Baby Lebsack
GPA 3.98

JiCong Shi

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JiCong Shi
Class Notes
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This 2 page Class Notes was uploaded by Dr. Baby Lebsack on Monday September 7, 2015. The Class Notes belongs to PHSX 115 at Kansas taught by JiCong Shi in Fall. Since its upload, it has received 34 views. For similar materials see /class/182457/phsx-115-kansas in Physics 2 at Kansas.


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Date Created: 09/07/15
Summary of Chapter 16 amp 17 0 There are two kind of electric charges7 positive and negative The total charges is conserved Like charges repel and opposite charges attract o The magnitude of the force between two charges is F kQIZQZ 7 The net force from several charges is the vector sum of all the forces between each pair 0 The magnitude of the electric eld E7 is at any point in space is the electric force per unit charge and the direction of E is the direction of the electric force on a positive charge at that point If there are multiple charges in space7 the total electric eld due to all charges is the vector sum of the electric eld due to each individual charge7 EE1E2E3 where is the electric eld due to charge 239 a Under the electric force7 an initially rested positive charge will move in the direction of E and an initially rested negative charge will move in the opposite direction of E Field lines indicate the direction of the eld7 eld lines start on positive charges and end on negative charges The electric force on a positive charge is in the same direction of the eld line and the force on a negative charge is in the opposite direction of the eld line 0 Electric Potential V The electric potential energy of a charge q inside electric eld is PE qV where q gt 0 for a positive charge and q lt 0 for a negative charge The electric potential is higher at the upstream of the eld lines and lower at the downstream of the eld lines Under the electric force7 an initially rested positive charge moves from higher V to lower V and an initially rested negative charge moves from lower V to higher V The change of the electric potential energy when a charge moves from point a to point b is PEI 7 PE QWZ 7 Va In a uniform eld such as inside a capacitor7 the electric potential difference between two points is V Ed where d is the distance between two points and V is the voltage difference of the two points The electric potential due to a single charge is Vk9 T where Q gt 0 for a positive charge7 Q lt 0 for a negative charge7 and V 0 when r 00 If there are several charges in space7 the total potential at a point P is T1 T2 VV1V2 where n is the distance from charge Ql to point P o Capacitor a capacitor can store electric charge and electric energy When a capacitor is connected to a battery7 one plate has positive charges and another plate has negative charges The amount of the positive charges equals the amount of the negative charges The amount of charges on each plate is Q CV The electric energy stored in a charged capacitor is 1 1 2 Q2 PEiiQViiOV 7 For a parallel plate capacitor7 the capacitance is A O 60E where A is the area of the plate and d is the distance between two plates


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