Write the definition and dimensional formula of the linear mass density of a string.

(N/A) Definition: The linear mass density (often denoted by $\mu$) of a string is defined as the mass per unit length of the string.
Mathematically,$\mu = \frac{M}{L}$,where $M$ is the mass of the string and $L$ is its length.
Dimensional Formula: Since mass has the dimension $[M]$ and length has the dimension $[L]$,the dimensional formula for linear mass density is:
$\mu = \frac{[M]}{[L]} = [M L^{-1} T^0]$.