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**1. The problem statement, all variables and given/known data**

C=epsilon(subscript0)L[[x+0.6L*epsilon(subscript1)+(0.4-x)epsilon(subscript2)]/d]

calculate the total energy stored in the capacitor, as a function of x [4 marks]

**2. Relevant equations**

U=0.5C*V^2

**3. The attempt at a solution**

I don't know what I am supposed to do here, if I just substitute C=... into the above formulae, it probably won't give me the answer they are looking for. Is there another equation I should use that is not the equation I mentioned? I do not know what Q is