The loop, having rotated by 45, rotates clockwise another 30, so the normal to the plane points

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Question:

The loop, having rotated by 45°, rotates clockwise another 30°, so the normal to the plane points at an angle of 75°with respect to the direction of the magnetic field. Find (a) the magnetic flux through the loop when 0=75" and (b) the change in magnetic flux during the rotation from 45 to 75.