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Please help me with this dielectrics problem

  • #1

Homework Statement


A parallel plate capacitor having plates of area S and plate separation d, has capacitance C1 in air. When two dielectrics of different relative permittivities ( ε1=2 and ε2=4) are introduced between the two plates as shown in the figure, the capacitance becomes C2. the ratio C2/C1 is

Homework Equations


C= ε0A/d[/B]


The Attempt at a Solution


if we name the components 1,2,3,4 in clockwise manner,in the solution 1 and 2 are taken in series and 3 and 4 are taken in series and they both are connected parallel,can we also take 1 and 4 in parallel and 2 and 3 in parallel and they both are connected in series?in that case answer comes out to be 12/5 where have i gone wrong?
[/B]
 

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Answers and Replies

  • #2
cnh1995
Homework Helper
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can we also take 1 and 4 in parallel and 2 and 3 in parallel and they both are connected in series?
No. Electric field between 1 and 2 (left half) is not same as the electric field between 3 and 4(left half).
 
  • #3
No. Electric field between 1 and 2 (left half) is not same as the electric field between 3 and 4(left half).
sir 2 is not left half,1234 in clockwise direction
 
  • #4
sir 2 is not left half,1234 in clockwise direction
sir,do you mean to say that the potential difference between positive terminal and interface between 1 and 2 is not same as potential difference between positive terminal and interface between 3 and 4.
 
  • #5
No. Electric field between 1 and 2 (left half) is not same as the electric field between 3 and 4(left half).
sir,do you mean to say that the potential difference between positive terminal and interface between 1 and 2 is not same as potential difference between positive terminal and interface between 3 and 4.
 

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