(a) Find the coordinates of the foot of the perpendicular drawn from the point $P(0,2,3)$ to the line $\;\frac{x+3}{5}=\;\frac{y-1}{2}=\;\frac{z+4}{3}$.OR(b) Three vectors $\overset{\rightarrow}{a}, \overset{\rightarrow}{b}$ and $\overset{\rightarrow}{c}$ satisfy the condition $\overset{\rightarrow}{a}+\overset{\rightarrow}{b}+\overset{\rightarrow}{c}=\overset{\rightarrow}{0}$ Evaluate the quantity $\mu=\overset{\rightarrow}{a}\cdot \overset{\rightarrow}{b}+\overset{\rightarrow}{b}\cdot \overset{\rightarrow}{c}+\overset{\rightarrow}{c}\cdot \overset{\rightarrow}{a}$, if $\left|\overset{\rightarrow}{a}\right|=3$, $|\vec{b}|=4$ and $|\vec{c}|=2$