Three plates \( A, B, C \) each of area \( 50 \mathrm{~cm}^{2} \) have separation \( 3 \mathrm{~...

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Three plates \( A, B, C \) each of area \( 50 \mathrm{~cm}^{2} \) have separation \( 3 \mathrm{~mm} \) between \( A \) and \( B \) and \( 3 \mathrm{~mm} \) between \( B \) and \( C \). The energy stored when the plates are fully charged is
(a) \( 1.6 \times 10^{-19} \mathrm{~J} \)
(b) \( 2.1 \times 10^{-9} \mathrm{~J} \)
(c) \( 5 \times 10^{-9} \mathrm{~J} \)
(d) \( 7 \times 10^{-9} \mathrm{~J} \)
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