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Week 2

by: Brian Notetaker

Week 2 2140

Brian Notetaker
GPA 3.8

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About this Document

Besides the notes shown in class on Friday, here are the few notes and major points I compiled for week 2. This also includes a typed explanation for each question of the quiz this week
physics for science and engineering majors II
Dr. Rick Irving
Class Notes
Physics, Electric Fields
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This 2 page Class Notes was uploaded by Brian Notetaker on Friday January 22, 2016. The Class Notes belongs to 2140 at University of Toledo taught by Dr. Rick Irving in Winter 2016. Since its upload, it has received 47 views.


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Date Created: 01/22/16
If the charge is greater than zero (positive) then E field force goes out of reference point  and if below zero (negative) then the E field force goes in to reference point Charge magnitude unless specified is 1.6E­19 C E = kq/r  = mg/q F = Eq E field force only requires one charge to be present Positive charge field points to negative charge At point S, the distance is shorter to the electron and thus the will be affected more by  this charge than the proton (pointing in to electron), while at point R it is closer to the  electron so it will feel more of an affect from this charge. The proton field is also going  toward the electron so either way the force field felt by point R will be to the left.  Quiz review/explanations 1. positive charge goes to negative charge 2. field goes away from positive charges and since each point has the same charge then  each point is mostly affected by the charge closest to it.  3. Equation for electric field shown above 4. Same charge and opposite position means that the charges cancel out resulting in zero 5. Due to symmetry, just as in four, the only way that all of the fields can cancel is if  there is another charge present.  6. In position II or III the positive charge being added would be attracted to the negative  charge near by, but in position I the positive charges will repel one another and the  extra repulasion from the +2 charge will be canceled out by the attraction from the  much farther away charge of ­4. 7. The sum of opposite fields results in the rightward vector 8. Since F = Eq, the only possible way for no force to be present on a charge is if the  electric field is zero 9. Electric field means that the negative charges are in the direction of the field (In this  case west). Thus, the positive charges are to the east which the electron would be  attracted. Can also be understood using F = Eq. F and E will always be in the same  direction when a proton is used since a vector x a scalar quantity leaves the vector in  the same direction, but since q is negative the force vector will flip 180 degrees in  comparison to the Electric field, thus East.  2 10. A) k(3q)/r B) kq/r 2 C) Pythagorean theorem after adding vectors to get the resultant.  Notes Force is along the field lines For electric field force the acceleration of the particle must be constant


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