6.67 × 10^-8 dyne.cm²/g²
we know ,
1 dyne = 10^-5 N
1 cm = 10^-2 m
1 g = 10^-3 kg
use this here ,
6.67 × 10^-8 × ( 10^-5) .(10^-2)²/(10^-3)²
= 6.67 × 10^-8 { 10^-5× 10^-4 /10^-6} Nm²/kg²
= 6.67 × 10^-8- × 10^-3 N.m²/kg²
= 6.67× 10^-11 Nm²/kg²
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