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  • A parallel plate capacitor has a plate of length l, width w, & separation of plates is d. If it is connected to a battery of emf V, A dielectric slab of the same thickness d & of dielectric constant K = 4 is being inserted between the plates of

A parallel plate capacitor has a plate of length l, width w, & separation of plates is d. If it is connected to a battery of emf V, A dielectric slab of the same thickness d & of dielectric constant K = 4 is being inserted between the plates of the capacitor. At what length of the slab inside states, will the energy stored in the capacitor be two times its initial energy stored?
Option: 1 \frac{2l}{3}
Option: 2 \frac{l}{2}
Option: 3 \frac{l}{3}
Option: 4 \frac{l}{4}

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