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 community Discussion Response Post to: electrostatics
Forum Index -> Electricity -> View Full Question like the article? email it to a friend.  
Author Message
neeraj_agarwal_1990 (887)

Blazing goIITian

Olaaa!! Perrrfect answer. 135  [241 rates]

neeraj_agarwal_1990's Avatar

total posts: 2039    
offline Offline
potential at center due to...
1) q is kq/x
2) 2q is k(2q)/x
Let new charge on sphere be 't' (after earthing)

potential at center due to sphere itself is kt/r

net potential should be 0 after earthing...so..

kq/x + 2kq/x + kt/r=0
=>3q/x + t/r=0
=> t= -3qr/x

so it acquires net -ve charge...this means some +ve charge has flown away from the sphere equal to +3qr/x

so answer should be (C)
 this reply: 10 points  (with Olaaa!! Perrrfect answer.   in 2 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