An electromagnetic wave is given in SI units by E$($x$,$ t$)=4\mathrm{.}50$ sin$(0\mathrm{.}52$x $$t$)$ V$/$m$.($Use the exact values you enter to make later calculations.$)($a$)$ What is the angular frequency? rad$/$s $($b$)$ What is the magnetic field at x $=2\mathrm{.}0$ m and t $=3\mathrm{.}0$ s$?$