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Three identical metallic plates A,B and C are initially given charges Q,4Q,2Q respectively. If the plates A and C are connected by a conducting wire and plate B is earthed ,then how much charge flows from earth to plate B.

Three identical metallic plates A,B and C are initially given charges Q,4Q,2Q respectively. If the plates A and C are connected by a conducting wire and plate B is earthed ,then how much charge flows from earth to plate B.

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Grade:12th pass

4 Answers

Rahbar Ahmad
23 Points
7 years ago
A and C are connected, so charges on each will become (Q+2Q)/2= 1.5Q
B will be eartherd so -4Q charge will flow from earth to B and B will become chargeless
 
Thanx
 
 
Rahbar Ahmad
23 Points
7 years ago
-4Q charge will flow from earth to sphere B
 
thanx
Akshay
11 Points
one year ago
Lol no dude Rahbar Ahmed
That's not how you these types of questions
Better to get conceptual clarity rather than just mugging things up
Akshay
11 Points
one year ago
We know A and C plates form an isolated system so the sum Qa + Qc=3 Q
Now taking B as an isolated system using we know the potential on B is zero hence we can use the formula for potential to get another relation between Qaand Qc 
Now equate potentials of plates A and C to get final charge on plate B(QB)
Now 4  Q- QB will fetch you the required answer
Answer will be

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