A long current carrying wire is bent as shown. The magnetic field induction at $\mathrm{O}$ is

A short current carrying conductor is placed perpendicular to the axis of a current carrying ring as shown. The direction of force acting of the conductor is

Figure shows an arrangement in which long parallel wires carrying equal currents into or out of the page of paper at the corners of a square. The magnetic field at the centre of square is

What is the magnetic field $\left|\overrightarrow{B}\right|$ at the point $P$ due to a current carrying wire of length $AB$ (having a current of $2 A$) shown in figure?

What is the force experienced by a semicircular wire, of radius $\mathrm{R}$ when it is carrying a current $\mathrm{I}$ and is placed in a uniform magnetic field of induction $\mathrm{B}$ as shown in figure?