Understanding Electric Fields and Charges
Explore the concepts of electric fields, charges, and dipoles in Chapter 26. Learn about E-Field models, Coulomb's Law, and the behavior of positive and negative point charges. Understand the superposition of E-Fields and how to calculate electric fields in different scenarios.
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Announcements Homework for tomorrow (Ch. 26 CQ 2, Probs. 4 & 6) CQ10: A is negative 25.16: zero 25.34: 1.8 x 10-4N, 0ofrom x-axis 25.38: 1.8 x 10-4N, 52oCW from x-axis Office hours MW 10-11 am TR 9-10 am F 12-1 pm Tutorial Learning Center (TLC) hours: MTWR 8-6 pm F 8-11 am, 2-5 pm Su 1-5 pm
Chapter 26 The Electric Field (E-Field Models & E-Field of Multiple Point Charges)
Last time The Electric field is defined as +q The magnitude of the E-field of a pt. charge is
Permittivity constant.. Define a new constant.. so that Coulomb s Law becomes
Electric Fields & Superposition Q: @ P, what is the E-field? P q1 q2 q3
Electric Fields & Superposition Q: @ P, what is the E-field? P q1 q2 A: @ P, q3
i.e. 26.1: The electric field of 3 equal pt. q s Three equal positive point charges q are located on the y- axis at y = 0 and at y = d. What is the electric field at a point on the x-axis? q1 d P q2 x d q3
i.e. 26.1: The electric field of 3 equal pt. q s Three equal positive point charges q are located on the y- axis at y = 0 and at y = d. What is the electric field at a point on the x-axis? q1 d P q2 x d q3
The Electric Field of a Dipole An Electric Dipole is 2 equal but opposite charges separated by a small distance. +q Kinds: Permanent Electric Dipole (i.e. H2O) Induced Electric Dipole (i.e. polarized atom) s Dipole Moment -q
The Electric Field of a Dipole Calculate the electric field of a dipole on the axis of the dipole y P +q s x -q
The Electric Field of a Dipole Calculate the electric field of a dipole on the axis of the dipole y P +q s x -q Notice: r is distance measured from the center of dipole.
Quiz Question 1 The diagram shows a positive charge +q and a negative charge q with the same magnitude. The electric field at point P on the plane that bisects the dipole is: Up. Down. Left. Right. Zero. 1. 2. +q 3. 4. P 5. -q
The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. y +q s x -q
The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. y +q s x -q
The Electric Field of a Dipole Calculate the electric field of a dipole in the plane that bisects the dipole. y +q s x -q Notice: field is opposite to p & half the strength of on-axis field.
