An area of cross-section of a rubber string is $2 \, cm^2$. Its length is doubled when stretched with a linear force of $2 \times 10^5 \, dynes$. The Young's modulus of the rubber in $dyne/cm^2$ will be:
- A$4 \times 10^5$
- B$1 \times 10^5$
- C$2 \times 10^5$
- D$1 \times 10^4$
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