Young's modulus of steel is 1.9 X 10¹¹ N m^-2. When expressed in CGS units of dyne/cm², it will be equal to (IN = 10⁵ dyne, 1m² = 10⁴ cm²)   [NCERT Exemplar]
 

Given, Young's modulus, Y = 1.9x 10¹¹ Nm^-2
            1 N = 10⁵ dyne
Hence,      Y = 19 X 10¹¹ x 10⁵ dyne/m²
We know that, 1 m = 100 cm
$\therefore$                    Y = 19 X 10¹¹ x 10⁵ dyne/(100)² cm²
                            =1.9x 10^{16 - 4} dyne/cm²
                        Y = 1.9 X 10¹² dyne/cm²