area vector of the loop is given by
[tex]A = 0.08 * 0.03 (k)[/tex]
area vector is always perpendicular to the plane of the loop
[tex]A = 24 * 10^{-4} (k)[/tex]
now the magnetic field vector is given as
[tex]B = 4.5 (cos30 (j) + sin30 (k))[\tex]
[tex]B = 3.89 j + 2.25 k[/tex]
now the magnetic flux is given by
[tex]\phi = B. A[\tex]
[tex]\phi = (3.89 j + 2.25 k ).(24 * 10^{-4} k)[/tex]
[tex]\phi = 5.4 * 10^{-3} Wb[/tex]