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A sheet of copper is inserted in the air...

A sheet of copper is inserted in the air gap of a parallel plate capacitor, without touching any of the two plates of the capacitor. The capacitance of the capacitor is

A

maximum when the sheet is mid way between the plates

B

maximum when the sheet is just near the positive plates

C

maximum when the sheet is just near the negative plate

D

invariant for all positions of the sheet

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The correct Answer is:
D
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