A \( 16 \, \Omega \) wire is bend to form a square loop. A \( 9 \, \text{V} \) battery with internal resistance \( 1 \, \Omega \) is connected across one of its sides. If a \( 4 \, \mu\text{F} \) capacitor is connected across one of its diagonals, the energy stored by the capacitor will be \( \frac{x}{2} \, \mu \text{J} \), where \( x = \) __________.
