Ans is (B) kindly help

Is it C?

No it is (B)

Nice question.

Post more such challenging physics questions

Bro I gotta give a test soon, sorry

I’ll send solution by evening

ok

Can you confirm my answer sooner? I’m getting x=8

Brother I’ll try whenever I get time. Can’t guarantee when though.

yes … vaise bina differentiate kie bhi keh sakte hai ki force tabhi max hoga jab both charges are equal…

ha got it bro pr diffnctiate krne ka bss janna chah rhe the

@complexroots @Ishaan_Shrivastava @Naman1 @adikap13 @harsh2 @Cooljet123

how do i obtain expression for option b… ans is abc

Ok so if you write thermal equilibrium equation for outer shell (which has some radius kR) then we will obtain the relation:

T(out)*sqrt(k)=T(in)
and now we can write thermal equilibrium for inner shell, and then we can obtain formula for T(in), which is:
T(in)^4 = (P/((4pi*R^2*(sigma)))*(k^2)/(k^2-1)

And hence we can say that the temperature if inner shell is dependent on radius of outer shell.