Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions?

Two metal wires of identical dimensions are connected in series. If $\sigma_{1}$ and $\sigma_{2}$ are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

Equation of one of the tangents passing through $(2,8)$ to the hyperbola $5 x^2-y^2=5$ is

An electron is projected along the axis of a circular conductor carrying current $I$. The electron will experience:

The wire of a flash bulb is made of which of the following?

$A$ metal rod moves at a constant velocity in a direction perpendicular to its length. $A$ constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement from the following: