Solution to task 451 from Chertov´s for extramural stud

Solution to task 451 from Chertov´s for extramural stud

451. A flat contour with an area of S = 20 cm2 is in a uniform magnetic field (B = 0.03 T). Determine the magnetic flux Ф, penetrating the contour, if its plane makes an angle φ = 60 ° with the direction of the induction lines.