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- Homework Statement
- Represent the system as the superposition of a polarized dielectric slab and a vacuum capacitor to find the total electric field in the capacitor in terms of Q and the polarisation P. Then find the relationship between the displacement vectorD and Q.

- Relevant Equations
- Lorentz field? E=q/(A*sigma0)

Not sure how to set this question up or how to get to the second half