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by: Jairo Dooley

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# General Physics II PHY 2049

Jairo Dooley
USF
GPA 3.9

Robert Chang

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COURSE
PROF.
Robert Chang
TYPE
Class Notes
PAGES
3
WORDS
KARMA
25 ?

## Popular in Physics 2

This 3 page Class Notes was uploaded by Jairo Dooley on Wednesday September 23, 2015. The Class Notes belongs to PHY 2049 at University of South Florida taught by Robert Chang in Fall. Since its upload, it has received 10 views. For similar materials see /class/212681/phy-2049-university-of-south-florida in Physics 2 at University of South Florida.

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Date Created: 09/23/15
Dr Chang Kirchhoff s Rules Junction Rule Assign the direction of currents at a junction if none is specified for you If there is only one battery in the circuit it is easy to get the directions right However even if you guessed wrong it would not change the calculation for the current except your answer will come out negative telling you the current direction is actually opposite to the one you have assigned Make sure you have at least one leaving or entering the junction In other words 21m Z I out total current going into a junction must equal to the total current coming out Loop Rule Assign either a clockwise or counterclockwise loop your choice Follow the loop direction and sum the AV across each of the elements R and Battery in the loop The sum of AVs should be zero because you return to the starting point When you come across a resistor R in the loop see whether the current I which you assigned the direction flowing through R is in the same direction as the loop direction To determine whether the AV across R is or study the following figures R AVIR Loop Direction R AVIR Loop Direction 1 W R AVIR 4 Dr Chang Loop Direction R AVIR Loop Direction Why do we get potential drop when the 1 direction in R and Loop Direction are the same Because when the current flows through a resistor the potential V drops by an amount equal to IR lfyou in following the loop direction also goes in the same direction as I as in the first and last figures above then you see also AV IR Now you understand what happens to AV when the Loop Direction is opposite to the current It is easy to determine AV when you come across a battery in the loop I AV Vbattery because you go from high side to low side gt Loop Direction I I AV Vbattery as you go from low side to high side Loop Direction The rest of solving problems using Kirchhoff s Rules has to do with knowing how to solve simultaneous equations You need to have the same number of equations from applying Kirchhoff s Rules as the number of unknown currents in the circuit Dr Chang When will there be a magnetic force FB present 0 When you have a charged particle moving in a magnetic field 0 FB q vx B 0 FB qu sine if v and B lie on the same plane 0 Carry out cross product of v ijk and B ijk if they do not lie on the same plane 0 What righthand Rule to use here 0 When you have a currentcarrying wire placed in a magnetic field 0 FB Lx B L has the direction as current I in the wire 0 FB ILB sine if L and B lie on the same plane 0 Carry out cross product of L ijk and B ijk if they do not lie on the same plane 0 What righthand Rule to use here 0 When you have two currentcarrying wires one wire and a loop or two loops 0 Figure out the magnitude and direction of B field generated by one wireloop at the location of the other wireloop see below Other than using a magnet what other ways to produce a B field Use current carrying wires Note that the B field produced is not uniform o Infinitely long straight wire lBl pol211a Rthand Rule 0 Finite length straight wire lBl pol411a sinel sinez Rthand Rule 0 Arc of wire lBlcenter pol411a 6 Rthand Rule 0 Circular loop lBlcenter pol2a Rthand Rule 0 Square Loop HW problem Rthand Rule 0 Rectangular Loop Think Rthand Rule 0 Coil Solenoid lBlinside uonl uoNll Rthand Rule Draw a figure to go with each of the above

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