Mica is a good dielectric material with high permittivity and can be placed between capacitor plates to increase capacitance. Tin, copper, and stainless steel are conductors and are not suitable as the dielectric.
In order to enlarge the capacitance of parallel plate capacitor, one should initiate among the plates of sheet:
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.