A capacitor stores \( 60 \mu \mathrm{C} \) charge when connected across a battery. When the gap ...

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A capacitor stores \( 60 \mu \mathrm{C} \) charge when connected across a battery. When the gap between the plates is filled with a dielectric, a charge of \( 120 \mu \mathrm{C} \) flows through the battery. The dielectric constant of the
\( P \) material inserted is :
(A) 1
(B) 2
(C) 3
(D) none
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