Suppose two rotors with inertias \[{{l}_{1}}\] and \[{{l}_{2}}\] on shafts of Length \[{{l}_{1}}\] and \[{{l}_{2}}\] respectively, are connected by gears such that the speed of the \[{{l}_{2}}\] rotor is always G times that of the \[{{l}_{2}}\] rotor. This system may, for vibration analysis, he treated as being on one shaft (integral with \[{{i}_{1}}\]) if:

• A. \[{{l}_{1}}\] is changed to \[{{G}^{2}}{{I}_{1}}\]
• B. \[{{I}_{2}}\] is changed to \[{{G}^{2}}{{I}_{2}}\]
• C. \[{{I}_{1}}\] is changed to \[{{\text{I}}_{\text{1}}}\text{/}{{\text{G}}^{\text{2}}}\]
• D. \[{{I}_{2}}\] is changed to \[{{\text{I}}_{2}}\text{/}{{\text{G}}^{\text{2}}}\]