A uniform thin rod AB of length L has linear mass density\[\mu (x)=a+\ – McqOptions

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1.	A uniform thin rod AB of length L has linear mass density\[\mu (x)=a+\frac{bx}{L}\], where x is measured from A. If the CM of the rod lies at a distance of \[\left( \frac{7}{12} \right)\]L from A, then a and b are related as :
A.	\[a=2b\]
B.	\[2a=b\]
C.	\[a=b\]
D.	\[3a=2b\]
Answer» C. \[a=b\]

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