Two small drops of mercury each of radius \( R \) coalesce to form ...

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Two small drops of mercury each of radius \( R \) coalesce to form a single large drop. The ratio of total surface energy before and after the change is
(1) \( 2: 1 \)
(2) \( 1: 2 \)
(3) \( 2^{\frac{1}{3}}: 1 \)
(4) \( 1: 2^{\frac{1}{3}} \)
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