A) \[_{a}{{\mu }_{r}}={{\,}_{a}}{{\mu }_{w}}\times \,{{\,}_{r}}{{\mu }_{\omega }}\]
B) \[_{a}{{\mu }_{r}}\times {{\,}_{r}}{{\mu }_{w}}={{\,}_{w}}{{\mu }_{a}}\]
C) \[_{a}{{\mu }_{r}}\times {{\,}_{r}}{{\mu }_{a}}=0\]
D) \[_{a}{{\mu }_{r}}/{{\,}_{w}}{{\mu }_{r}}={{\,}_{a}}{{\mu }_{w}}\]
Correct Answer: D
Solution :
\[\frac{_{a}{{\mu }_{r}}}{_{w}{{\mu }_{r}}}=\frac{{{\mu }_{r}}/{{\mu }_{a}}}{{{\mu }_{r}}/{{\mu }_{w}}}=\frac{{{\mu }_{w}}}{{{\mu }_{a}}}={{\,}_{a}}{{\mu }_{w}}\]
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