Problem in calculating young mudulus

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SUMMARY

The calculation of Young's modulus involves the formula Y=(F/A)/(dL/L), where A represents the area. For cylindrical shapes, the area can be calculated differently based on the direction of the applied force. When the force is radial, the surface area of the cylinder, calculated as 2(pi)r*L, is used. Conversely, if the force is axial, the cross-sectional area, given by (pi)r^2, is appropriate.

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waqarrashid33
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Young moduls can be given as:

Y=(F/A)/(dL/L)
but in area i am confused because sometine for cylindrical shape it is taken as 2(pi)r*L and sometime simply (pi)r^2.
Please deffrientiate these cases:
 
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If the force is radial, then you need the surface area of the cylinder; if the force is axial, you need the cross-sectional area.
 

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