A parallel plate capacitor has a parallel slab of copper inserted b...

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A parallel plate capacitor has a parallel slab of copper inserted between and parallel to the two plates, without touching the plates. The capacity of the capacitor after the introduction of the copper sheet is :
P
(A) minimum when the copper slab touches one of the plates.
(B) maximum when the copper slab touches one of the plates.
W
(C) invariant for all positions of the slab between the plates.
(D) greater than that before introducing the slab.
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