Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

edr1c

Charge Q is applied to a circular disk of ebonite of radius a by rubbing it while it is rotating. in this way, the surface charge density becomes proportional to the radial distance from the center. Show that the electric field strength on the axis of the disk at an axial distance h from the center is \[E=\frac{ 3Qh }{ 4\pi \epsilon_{0}a^{3} }\left[ \ln \frac{ a+\sqrt{a^2+h^2} }{ h }-\frac{ 1 }{\sqrt{a^2+h^2}} \right]a_{n}\]

  • 7 months ago
  • 7 months ago

  • This Question is Closed
  1. amandasoto144
    Best Response
    You've already chosen the best response.
    Medals 0

    OMG!, this looks like Chinese to me!!

    • 7 months ago
  2. amandasoto144
    Best Response
    You've already chosen the best response.
    Medals 0

    @thomaster can you help this, looks like chinese

    • 7 months ago
  3. amandasoto144
    Best Response
    You've already chosen the best response.
    Medals 0

    @satellite73

    • 7 months ago
  4. edr1c
    Best Response
    You've already chosen the best response.
    Medals 0

    i'd almost get the integral form, but the maths is confusing. is it possible to integrate \[\int\limits_{}^{}\frac{ a^2 }{ a^2+h^2 }da\]without involving any trigo substitution? or trigo substitution is the only method to solve this?

    • 7 months ago
  5. edr1c
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont get this, obtained from wolfrom =X how (h^2 + H^2 tan^2 u)^3/2 becomes h^3 sec^3 u?

    • 7 months ago
    1 Attachment
  6. edr1c
    Best Response
    You've already chosen the best response.
    Medals 0

    need help simplifying some intermediate steps \[\left\{ \ln \left[ \sqrt{\frac{ r^2 }{ h^2 }+1}+\frac{r}{h} \right] -\frac{ rh \sqrt{\frac{ r^2 }{ h^2 }+1} }{ r^2+h^2 } \right\}\]

    • 7 months ago
  7. E.ali
    Best Response
    You've already chosen the best response.
    Medals 0

    @:edr1c:POwers can kill the Radicals ! Try!:)

    • 7 months ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.