આકૃતિમાં દ્રવ્ય $A$ અને $B$ માટે પ્રતિબળ-વિકૃતિ-આલેખ દર્શાવેલ છે.

આલેખ સમાન માપક્રમ પર દોરેલ છે.

$(a)$ કયા દ્રવ્યનો યંગ મૉડ્યુલસ મોટો હશે ?

$(b)$ બેમાંથી કયું દ્રવ્ય વધુ મજબૂત હશે ? 

(a) A ; (b) A

 

For a given strain, the stress for material $A$ is more than it is for material $B ,$ as shown in the two graphs.

Young's modulus $=\frac{\text { stress }}{\text { strain }}$

For a given strain, if the stress for a material is more, then Young's modulus is also greater for that material. Therefore, Young's modulus for material $A$ is greater than it is for material $B.$

The amount of stress required for fracturing a material, corresponding to its fracture point, gives the strength of that material. Fracture point is the extreme point in a stress-strain curve. It can be observed that material $A$ can withstand more strain than material $B$.

Hence, material $A$ is stronger than material $B$.