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There is an air-filled parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to . The dielectric constant of wax is:
(a)
(b)
(c)
(d)

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Important Questions on Electrostatic Potential and Capacitance
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CUET (UG)
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A dielectric slab is inserted between the plates of an isolated charged capacitor. Which of the following quantities remain unchanged?

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CUET (UG)
IMPORTANT
A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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CUET (UG)
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A parallel plate condenser with oil (dielectric constant ) between the plates has capacitance. If oil is removed, the capacitance of capacitor becomes

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CUET (UG)
IMPORTANT
Capacitance of a capacitor made by a thin metal foil is . If the foil is folded with paper of thickness , dielectric constant of paper is and width of paper is , the length of foil will be

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CUET (UG)
IMPORTANT
Two identical air core capacitors are connected in series to a voltage source of . If one of the capacitors is filled with a medium of dielectric constant , the new potential across this capacitor is

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CUET (UG)
IMPORTANT
A parallel-plate capacitor of plate area and plate separation is charged to potential difference and then, the battery is disconnected. A slab of dielectric constant is, then, inserted between the plates of the capacitor. So, as to fill the space between the plates. If and denote the magnitude of charge on each plate, the electric field between the plates (after the slab is inserted) and the work done on the system, in the process of inserting the slab respectively, then, choose the incorrect option based on the given information.

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CUET (UG)
IMPORTANT
A slab of copper of thickness is introduced between the plates of a parallel plate capacitor which touches one of the plates of the capacitor, where is the separation between its two plates. If the capacitance of the capacitor without copper slab is and with copper slab is , then is

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CUET (UG)
IMPORTANT
A parallel-plate capacitor is connected to a battery. A metal sheet of negligible thickness is placed between the plates. The sheet remains parallel to the plates of the capacitor.
