An electric potential difference will be induced between the ends of the conductor shown in the diagram when the conductor moves in the direction:

Which among the following is $NOT$ a feature of $S_N2$ mechanism?

The focal distance of a point on the parabola $y^2 = 16x$ whose ordinate is twice the abscissa,is

In $\triangle ABC$, the midpoints of the sides $AB, BC$, and $CA$ are respectively $(l, 0, 0), (0, m, 0)$, and $(0, 0, n)$. Then, $\frac{AB^2+BC^2+CA^2}{l^2+m^2+n^2}$ is equal to

Two concentric coils each of radius equal to $2\pi \, cm$ are placed at right angles to each other. $3\, A$ and $4\, A$ are the currents flowing in each coil respectively. The magnetic induction in $Wb/m^2$ at the centre of the coils will be $(\mu_0 = 4\pi \times 10^{-7} \, Wb/A \cdot m)$.

Principal,azimuthal and magnetic quantum numbers are respectively related to