mechanics of materials

A metal bar with a cross-sectional area of 50mm2 is subjected to a tensile strain of 0.001. What is the tensile force responsible for the strain given that the material has a Young's modulus of 15GNm raise to the power -2
A 0.003N
B 7.5x10 raise to the power 3
C 7.5x 10 raise to the power -10
D 3x10 raise to the power 12

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