29. An area of cross-section of rubber string is 2 cm

29. An area of cross-section of rubber string is 2 cm² . Its length is doubled when stretched with a linear force of 2×10⁵dynes. The Young’s modulus of the rubber in dyne/cm²  will be

(a)  4×10⁵                                          (b) 1×10⁵

(c) 2×10⁵                                          (d) 4×10⁴

Answer-B

(6)