sign up I login
 advanced
refer a friend - earn nickels!!

Ask & Discuss Questions with Community & Experts

 Moderation Team
Ask iit jee aieee pet cbse icse state board experts Discussion Response Post to: Electrostat
Forum Index -> Electricity -> View Full Question like the article? email it to a friend.  
Author Message
[Post New]29 Apr 2008 12:54:03 IST
    Subject: Re:Electrostat
[Up]
elastiboysai (2327)

Blazing goIITian

Olaaa!! Perrrfect answer. 421  [532 rates]
elastiboysai's Avatar
total posts: 573    
offline Offline

\mbox{The 3 charges will be 3 vertices of a tetrahedron }\\ \mbox{with the fourth vertex as the point of suspension}\\<br/>\mbox{Draw the perpendicular bisector of one side}\\<br/>\mbox{ from the point of suspension}\\<br/>\frac{F_(electr.)}{F_(gravit.)}=\frac{x/2}{\sqrt{{l^2}-\frac{x^2}{4}}}\\<br/>\mbox{approximate it as}\frac{x}{2l} (x<<l)\\<br/>\frac{2q^2}{4 \pi \epsilon_0 x^2 mg}=\frac{x}{2l}\\<br/>x=q^\frac{2}{3}(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{3}\\<br/>\mbox{Now for some manipulation}\\<br/>\frac{dx}{dt}=\frac{dx}{dq} \cdot \frac{dq}{dt}\\<br/>\frac{dq}{dt}=\frac{a}{\frac{dx}{dq} \cdot \sqrt{x}}\\<br/>\frac{dx}{dq}=(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{3}q^\frac{1}{3}\\<br/>\sqrt{x}=(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{6}q^\frac{1}{3}\\<br/>\mbox{Substitute these and ull find}\\<br/>\frac{dq}{dt}=\frac{3a}{2}\sqrt{\frac{\pi \epsilon_0 mg}{l}}\\
 this reply: 20 points  (with 4 Olaaa!! Perrrfect answer.   in 4 votes )   [?]
 
You have to be logged on to rate
  
 

Top Offers for goIITians
Correspondence Courses
Brilliant Tutorials
Narayana Institute
Aakash Institute
Classroom/Crash Courses
Narayana - Kota , Delhi , Others
Brilliant Tutorials - Class , Crash
Aakash Institute - Medical , Engg
Online Test Series
Brilliant Tutorials
Narayana Institute
Aakash Institute
Mahesh Tutorials
AMITY      Sri Chaitanya