Figure shows a sheet of aluminium foil of negligible thickness placed

1.	Figure shows a sheet of aluminium foil of negligible thickness placed between the plates of a capacitor. How will its capacitance be affected if: (i) the foil is electrically insulated? (ii) the foil is connected to the upper plate with a conducting wire?
Answer» (i) No effect on capacitance if foil is electrically neutral. (ii) If foil is connected to upper plate with a conducting wire, the effective separation between plates becomes half, so capacitance is doubled

Figure shows a sheet of aluminium foil of negligible thickness placed between the plates of a capacitor. How will its capacitance be affected if: (i) the foil is electrically insulated? (ii) the foil is connected to the upper plate with a conducting wire?

Answer»

(i) No effect on capacitance if foil is electrically neutral.

(ii) If foil is connected to upper plate with a conducting wire, the effective separation between plates becomes half, so capacitance is doubled

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Figure shows a sheet of aluminium foil of negligible thickness placed between the plates of a capacitor. How will its capacitance be affected if: (i) the foil is electrically insulated? (ii) the foil is connected to the upper plate with a conducting wire?

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