Meena posted an Question
May 05, 2021 • 21:28 pm 2 points
  • IIT JAM
  • Physics (PH)

Electric field due to a charged sphere

I used the general formula of Electric field due to uniformly charged sphere and substituted charge = volume charge density x volume) and then volume charge density (row) = kr . I got, for rR, E inversely proportional to r .... but in ans it's given E inversely proportional to r^2 .. I have also attached how I solved.. could someone tell me where I hve misunderstood *correct option A*

1 Answer(s) Answer Now
  • 0 Likes
  • 1 Comments
  • 0 Shares
  • Som shekhar sharma Best Answer

    use integral formula for calculation taking dq element at distance r then integrate you will get correct option. You formula is only valid for constant charge density. hope you understand this basic concept.

    eduncle-logo-app

    could u explain more on constant charge density... and how in this case charge density is not constant?

    eduncle-logo-app

    you can see in your problem rho is varing with distance. charge density must not be function of time or distance, for constant charge density.

    eduncle-logo-app

    okay got it! thankyou so much

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers