A parallel plate capacitor with a dielectric slab completely occupying the space between the  plates is charged by a battery and then disconnected. The slab is pulled out with a constant speed. Which of the following curves represent qualitatively the variation of the capacitance $C$ of the system with time?

  • A
    814-a98
  • B
    814-b98
  • C
    814-c98
  • D
    814-d98

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