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Q.

A parallel plate capacitor with a dielectric slab completely occupying the 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 ?

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a

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b

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c

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d

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answer is A.

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Detailed Solution

C=ε0d(a+(k−1)xl)⇒C=ε0d[a+(k−1)l(a−vt)]⇒Linear

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A parallel plate capacitor with a dielectric slab completely occupying the 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 ?