The two plates of a parallel plate capac...

The two plates of a parallel plate capacitor are `4 mm` apart. A slab of dielectric constant 3 and thickness `3 mm` is introduced between the plates is so adjusted that the capacitance of the capacitor becomes `(2)/(3) rd` of its original value. What is the new distance between the plates ?

9 mm

21 mm

5 mm

8 mm

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