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Grade 12th passElectrostatics

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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Arif Ahmed

11 Years agoGrade 12th pass

4 Answers

Rahbar Ahmad

11 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

11 Years ago

-4Q charge will flow from earth to sphere B

thanx

Akshay

5 Years 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

5 Years ago

We know A and C plates form an isolated system so the sum Q_{a +} 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 Q_aand Qc

Now equate potentials of plates A and C to get final charge on plate B(Q_B)

Now 4 Q- Q_B will fetch you the required answer

Answer will be

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