At a given instant, the current and self-induced emf, in an inductor, are directed as shown in the figure. If the induced emf is $17 \mathrm{V}$ and the rate of change of current is $25 \mathrm{kA} {\mathrm{s}}^{-1}$, then the correct statement is,

The number of turns, cross-sectional area and length for four solenoids are given in the following table. 

The solenoid with maximum self inductance is 

A circular wire loop of radius $R$, is placed in an $X-Y$ plane, Centre at the origin $O$. A square loop of side $a \left(a<<R\right)$, having two turns, is placed with its center at $z=\sqrt{3}R$, along the axis of circular wire loop, as shown in the figure. The plane of the square loop makes an angle of ${45}^{\circ }$ with respect to the $z$-axis. If the mutual inductance between the loops is given by $\frac{{\mu }_0{a}^2}{2^{p/2}R}$, then the value of $p$ is