An iron rod has a length of $10 \ cm$ at $20^{\circ}C$. What will be the change in length of the iron rod at $19^{\circ}C$? (Given for iron,$\alpha = 11 \times 10^{-6} \ ^{\circ}C^{-1}$)
- A$11 \times 10^{-6} \ cm$ increase.
- B$11 \times 10^{-6} \ cm$ decrease.
- C$11 \times 10^{-5} \ cm$ decrease.
- D$11 \times 10^{-5} \ cm$ increase.
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