Drift velocity ${v_d}$ varies with the intensity of the electric field $E$ as per the relation:

$A$ plane passing through $(-1, 2, 3)$ and whose normal makes equal angles with the coordinate axes is

The vector sum of two forces is perpendicular to their vector difference. In that case,the forces

The electrons,identified by quantum numbers $n$ and $l,$ $(i)$ $n = 4, l = 1$ $(ii)$ $n = 4, l = 0$ $(iii)$ $n = 3, l = 2$ $(iv)$ $n = 3, l = 1$ can be placed in order of increasing energy,from the lowest to highest,as

The $pH$ of $0.05 \ M$ acetic acid is $(K_a = 2 \times 10^{-5})$

The length of a spring is $\alpha$ when a force of $4\,N$ is applied on it and the length is $\beta$ when $5\,N$ force is applied. Then the length of the spring when $9\,N$ force is applied is