Electric Fields and their effect on matterProf. Stephen Sekula1/27/2011Supplementary Material for PHY1308 (General Physics – Electricity and Magnetism)1) What is the sign of the electric charge in this image?2) A positive charge is placed at location P. In what direction does it move?3) Each of the charges shown in the image at the right has the same magnitude, |q|=1.0C. What is the total charge represented by these two particles, including the sign of their total charge?123Announcements●Homework 1:●Due next Monday by 8pm–Use courses.smu.edu to submit, if possible●TA-led help sessions/office hours●Farley Ferrante: FS60–Thursday: 6-8pm●Jessica Ginsberg: FS157–Wednesday: 6-7pm–Saturday: 6-7pmDipole Electric Field (EXERCISE)-+Dipole Length = dPrHEIGHT = yOx = -ax = aDISTANCE TO O = xAssignments: 10 min.●Teams Red and Yellow:●Calculate the electric field of the POSITIVE charge at point P●Team Blue and Green●Calculate the electric field of the NEGATIVE charge at point P●Teams Purple and Tan●Calculate the electric field of the POSITIVE charge at point O●Team Orange●Calculate the electric field of the NEGATIVE charge atpoint OANSWERs●Electric field on perpendicular bisector:●Electric field on axis of dipole:Ebisector=−2kqaa2 y23/2i −2kqay3i (when y>>a)Eaxis=−kq1 xa2−1 x−a2i 4kqax3 (when x>>a)Stephen J. Sekula - SMU 7Dipole+-+-Cartoon of a water moleculeH+O2-H+Terminology:+-p=qd d“Dipole Moment”dSeparation of charges+ q- qStephen J. Sekula - SMU 8EDipole in electric field+-EEF+F-−- q+
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