The plates of a parallel plate capacitor are charged to \( 100 \mathrm{~V} \). Then a \( 4 \math...

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The plates of a parallel plate capacitor are charged to \( 100 \mathrm{~V} \). Then a \( 4 \mathrm{~mm} \) thick dielectric slab is inserted between the plates and then to obtain the original potential difference, the distance between the system plates is increased by \( 2.0 \mathrm{~mm} \). The dielectric constant of the slab is
(A) \( 5.4 \)
(B) \( 2.2 \)
(C) \( 2.0 \)
(D) \( 2.6 \)
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