Lecture_04 - Polarization of Atoms Force due to E created...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
+ E Force due to E created by positive charge shifts electron cloud and nucleus in opposite directions: electric dipole . An atom is said to be polarized when its electron cloud has been shifted by the influence of an external charge so that the electron cloud is not centered on the nucleus . Polarization of Atoms it is not a permanent dipole • an induced dipole is created when a neutral object is polarized by an applied electric field An applied electric field creates induced dipoles: p = qs = α E α - “ polarizability” of a material
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
r r q E ˆ 4 1 2 1 0 1 πε = r r q p ˆ 4 1 2 1 0 α πε = r r q E ˆ 2 4 1 5 1 2 0 2 α πε = r r q F ˆ 2 4 1 5 2 1 2 0 1 α πε = 1) 2) 3) 4) r r q F ˆ 2 4 1 5 2 1 2 0 2 α πε = 5) Neutral atoms are attracted by charges! Interaction strength ~ 1/r 5 A Neutral Atom and a Point Charge
Image of page 2
Repulsion: r r q q F R ˆ 4 1 2 2 1 0 πε = F R Attraction: r r q N F A ˆ 2 4 1 5 2 1 2 0 α πε = F A Total: r r q N r q q F ˆ 2 4 1 4 1 5 2 1 2 0 2 2 1 0 = α πε πε q 1 q 2 Interaction of like-charged Objects
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Interaction of Charged Objects Attraction: can happen also for like-charged objects! Repulsion: can happen only for like-charged objects! r r q N r q q F ˆ 2 4 1 4 1 5 2 1 2 0 2 2 1 0 = α πε πε Intervening matter does not shield E
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern