UH PHYS 1302 - Exam 1 Review (26 pages)

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Exam 1 Review



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Exam 1 Review

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exam 1 review


Pages:
26
School:
University of Houston
Course:
Phys 1302 - Introductory to Physics II
Unformatted text preview:

Exam 1 Review 19 1 2 Electric Charge Conductors and Insulators Measure of charge is Coulomb and its quantized Electrons have negative charge 1 6 x 1019 C Protons have positive charge 1 6 x 1019 C Create static electricity in insulators Giving materials extra electrons Take them a away 19 1 2 Electric Charge Conductors and Insulators Insulators Electrons localized to atoms cannot move freely within material Conductors Electron delocalized can move freely within material Semi conductors Somewhere in between Ability to conductor depends on environment Temperature light etc 19 3 Coulomb s Law Determines force between 2 charges Force attractive for unlike charges repulsive for like 19 3 4 5 Electric Field and Field Lines Measures force per unit of charge on test charge q0 q0 q Fields point in the direction of where free positive charge will move 19 6 Electric Shielding For conductors with excess charge charges move to surface Leads to zero field at the center Shielding 19 7 Electric Flux and Gauss s law Gauss s Law Flux through a surface enclosing charge q is 20 1 2 3 Electric Potential and Potential Energy Electric Potential can be thought of as electric potential energy per unit of charge If a charges gains or loses energy Moves through a region with a potential difference 20 1 2 3 Electric Potential and Potential Energy Change in electric potential energy is equal to the work done distance moved q0 Electric field For point charges q 20 4 Equipotential Surfaces Surfaces of equal electric potential Run perpendicular to electric field lines 20 5 6 7 Capacitors Dielectrics and Energy stored Capacitance of a system charge potential difference For parallel plates area separation 20 5 6 7 Capacitors Dielectrics and Energy stored Dielectrics boost capacitance by decreasing potential difference If V becomes too big dielectric breakdown I e it stops working Potential energy in a capacitor given by 21 1 Electric Current Flow of electric charge around closed path Direction of current is direction of positive charge EMF provides a potential difference drives current Electrics drift slowly electric signal propagates quickly 21 2 Resistance and Ohm s Law Ohm s relates voltage to current R resistance measured in Ohms High electrical small currents Resistivity Another way of characterizing resistance Given material dimensions we can figure out resistance 21 3 Energy and Power in Electric Circuits Movement of charge across potential differences leads to change in potential energy Power is change in energy divided by change in time Can be expressed in current and voltage Usually dissipates in the form of heat use Ohm s law to link to resistance 21 4 Resistors in Series and Parallel Req is equivalent or total resistance of circuit 21 5 Kirchhoff s Rules The junction rule Current entering the junction must equal the current leaving it Loop rule Sum of the potential differences around a loop must be zero 21 6 Circuits Containing Capacitors Ceq is equivalent or total capacitance of circuit 21 7 RC Circuits Circuits with a resistor and capacitor Current flow and charge on capacitor change after circuit is switched on Characteristic time 22 1 The Magnetic Field Magnetic poles generate magnetic field Like poles repel opposites attract Arrows show direction of force on north pole Earth s north pole is actually a magnetic south pole 22 2 The Magnetic Force on Moving Charges Moving charge experiences force in a magnetic field is angle between velocity and field directions Force is perpendicular to both velocity and field directions Right hand rule can be used to determine force direction 22 3 The Motion of Charged Particles in a Magnetic Field Since the magnetic force is always perpendicular to the direction of motion Path of a charge is circular in uniform field 22 4 and 22 5 Forces on Wires in Magnetic Field Torque on current loop in magnetic field A is area of loop 22 6 Electric Currents Magnetic Fields 22 7 Current Loops and Solenoid Magnetic field inside a solenoid is uniform L is length of solenoid N is number of turns 22 8 Magnetism in Matter Field off Field on Ferromagnetic Turn field on material becomes magnetic Turn field off material remains magnetic Paramagnetic Turn field on material becomes magnetic Turn field off material stops being magnetic Diamagnetic Opposes magnetic fields


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