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Understanding Electric Fields and Dipole Motion in Physics

This announcement covers essential topics related to Chapter 26 of our physics course, focusing on electric fields and the motion of dipoles within those fields. Key concepts include the electric field characteristics of charged planes, spheres, and capacitors, as well as the behavior of dipoles in uniform and non-uniform electric fields. Students are reminded of their homework due (problems 22 & 50) & office hours. The importance of tutorial sessions for deepening understanding is also highlighted.

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Understanding Electric Fields and Dipole Motion in Physics

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  1. Announcements • Homework for tomorrow… (Ch. 26, Probs. 22 & 50) CQ 8: 2nC/cm2 26.12: a) 0 b) –(4.1 x 103 N/C)ihat 26.42: Lim_{z<<R} -> KQz/R3 , Lim_{z>>R} -> KQ/z2 • Office hours… MTWRF 9-10 am • Tutorial Learning Center (TLC) hours: MW 8-5 pm T 8-6 pm R 8-11 am, 2-5 pm F 8-2 pm

  2. Chapter 26 The Electric Field (Motion of a dipole in an E-field)

  3. Last time… • E-field of a infiniteplane of charge.. • E-field of a sphere (of radius R) of charge.. • E-field of a parallel-plate capacitor..

  4. 26.7: Motion of a Dipole in an E-field Recall the polarization force between a q’ed & neutral object… • The qpolarizes the neutral object, creating an induced electric dipole. • The q then exerts an attractive force on the near end of the dipole that is slightly stronger than the repulsive force on the far end. - - - - - - - + - - + - - - + - - + - + - - + +

  5. Motion of a Dipole in an E-field Consider a dipole in a uniform electric field… Notice: • There is NO net force on a dipole in a uniform E-field. • The dipole experiences a torque… + -

  6. Motion of a Dipole in an E-field Consider a dipole in a uniform electric field… Notice: • There is NO net force on a dipole in a uniform E-field. • The dipole experiences a torque… + -

  7. Motion of a Dipole in an E-field Consider a dipole in a non-uniform electric field… Notice: • The dipole 1st rotates until aligned with the E-field. • The net force on a dipole is toward the direction of the strongest field. • A dipole will experience a net force toward any charged object.

  8. Quiz Question 1 An electrically neutral dipole is placed in an external field. In which situation(s) is the net force on the dipole zero? • (a) • (c) • (b) and (d) • (a) and (c) • (c) and (d) • Some other combination.

  9. i.e. 26.11: The force on a H2O molecule. H2O has a permanent dipole moment of magnitude 6.2 x 10-30 Cm. A water molecule is located 10 nm from a Na+ ion in a saltwater solution. What force does the ion exert on the H2O molecule?

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