Two identical condensers M and N are connected in series with a battery. The space between the plates of 'M' is completely filled with dielectric medium of dielectric constant 8 and a copper plate of thickness d/2 is introduced between the plates of N. (d = distance of separation of the plates). Then the potentials of M and N are respectively.

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1 : 4

4 : 1

3 : 8

1 : 6

answer is A.

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Detailed Solution

CM=kC0=8C0 ; CN=Aε0d-t=Aε0d-d/2=2C0M, N are in series ⇒ Q is sameVMVN=CNCM=2C08C0=14

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