A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
(A) 2×108 Nm-2
(B) 5×106 Nm-2
(C) 0.5×10-6 Nm-2
(D) 0.2×10-6Nm-2
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