Growth in living organisms occurs by

In $YDSE$, the separation between the slits is halved and the distance between the slit and the screen is doubled. The fringe width is

Which of the following is a polyamide?

Two point charges $-q$ and $+q$ are located at points $(0, 0, -a)$ and $(0, 0, a)$ respectively. The electric potential at a point $(0, 0, z)$,where $z > a$ is

Which stage of prophase-$I$ is represented in the given figure?

An inductance of $1 \ H$ is connected in series with an $AC$ source of $220 \ V$ and $50 \ Hz$. The inductive reactance (in ohm) is (in $\pi$)