A symmetrical I-section has a moment of inertia about the centroidal axis in its plane perpendicular to the web, of 22.34 × 104 mm4. The moment of inertia of the full rectangular area occupied by the I-beam cross section about this axis is 65 × 104 mm4.
The two empty spaces on either side of the web are square. What is the height of the web?
1
50 mm
2
30 mm
3
55 mm
4
40 mm