Question 147 of 172

A vector $\overrightarrow{a}$ is turned without a change in its length through a small angle $d\theta .$ The value of $\left|\Delta \overrightarrow{a}\right|$ and $\Delta a$ are respectively

(1) $0,ad\text{}\theta$

(2) $ad\text{}\theta ,0$

(3) 0, 0

(4) None of these