In a capacitor of capacitance \( 20 \mu \mathrm{F} \), the distance between the plates is \( 2 \...

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In a capacitor of capacitance \( 20 \mu \mathrm{F} \), the distance between the plates is \( 2 \mathrm{~mm} \). If a dielectric slab of width \( 1 \mathrm{~mm} \) and dielectric constant 2 is inserted between the plates, then the new capacitance is
(a) \( 2 \mu \mathrm{F} \)
(b) \( 15.5 \mu \mathrm{F} \)
(c) \( 26.6 \mu \mathrm{F} \)
(d) \( 32 \mu \mathrm{F} \)
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