_________ instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured?

The current $i$ in an inductance coil varies with time $t$ according to following graph,

Which one of the following plots shows the variations of voltage in the coil?

In pure inductive circuit, the curves between frequency $f$ and reciprocal of inductive reactance $\frac{1}{X_{\mathrm{L}}}$ is

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$