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Verified answer
20 cm = 0.2 m5 mm^2 = 5 x 10^-6 m^2
12 . 10^10 = ( 240 x 0.2 ) / ( 5 x 10^-6 x Δl )
12 . 10^10 = 48 / 5 . 10^-6 Δl
12 . 10^10 x 5 . 10 ^-6 Δl = 48
60 . 10^4 Δl = 48
Δl = 48 / 6 . 10^5
Δl = 8 . 10^-5 m atau 8 . 10^-3 cm
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