A coil has an inductance of \( 2 \, \text{H} \) and resistance of \( 4 \, \Omega \). A \( 10 \, \text{V} \) is applied across the coil. The energy stored in the magnetic field after the current has built up to its equilibrium value will be ________ \( \times 10^{-2} \, \text{J} \).
