The energy contained in a cylinder of cross- section\[10c{{m}^{2}}\]and length 50cm along the x-axis if electric field in an electromagnetic wave is given by \[E=50\,\sin \,\omega (t-x/c)\] is

• A. \[1.2\times {{10}^{-10}}\,J\]
• B. \[5.5\times {{10}^{-12}}\,J\]
• C. \[2.3\times {{10}^{-10}}\,J\]
• D. \[3.6\times {{10}^{-12}}\,J\]