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L3_1Apr_posted

# L3_1Apr_posted - Housekeeping Mastering Physics for...

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1 Physics 6C: Electric Fields in Matter 2 Housekeeping Mastering Physics for homework assignments ! course ID is: MPDEWEY6CS11 ! Homeworks will be due Mondays at 8pm » HW1 due 4/4 Class website on eCommons ! Physics 6C (61668) Discussion sections: ! Mon 10-11:30am ISB 235 (R. Dewey) ! Mon 4-5pm ISB 235 (G. Kaminsky) ! Wed 12-1:30pm ISB235 ! Thurs1-2:30pm ISB 165 (J. Martinez) ! Fri 12-1:30pm ISB 235 (G. Bowers) I will also have office hours Fridays 9:30 - 10:30 3 MSI sections There will be 3 MSI section times ! Mon 12:30-1:40 Oaks Learning Center ! Mon 3:30-4:40 Oaks Learning Center ! Fri 11-12:10 ARC 221 4 Charge distributions Electric field of a number of charges is the sum of the fields of the individual charges… ! keep in mind that individual fields are vectors ! sum is vector sum

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5 Continuous charge distributions Electric field of a number of charges is the sum of the fields of the individual charges: For continuous charge distributions sum, becomes an integral: 6 Point charges Electric field of point charge q ! r is unit vector pointing from charge to point where you’re calculating field ! r always points away from charge ˆ ˆ 7 Math subtlety: Both the charge q and the unit vector r carry sign/direction information ˆ 8 +Q Charge is positive ! q = +Q ! kq/r 2 is positive Simplest Case ! P
9 +Q Charge is positive ! q = +Q ! kq/r 2 is positive Coordinates of point P are “more positive” than coordinates of charge ! x- and y- components of unit vector are postive » point in +x and +y direction Simplest Case (2)

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L3_1Apr_posted - Housekeeping Mastering Physics for...

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