A wire is bent in the form of an equilateral triangle of side $100 \mathrm{cm}$ and carries a current of $2 A.$ It is placed in a magnetic field of induction $2.0 T$ directed perpendicular into the plane of paper. The direction and magnitude of magnetic force acting on each side of the triangle will be

Two straight long conductors $AOB$ and $COD$ are perpendicular to each other and carry currents $i_1$ and $i_2.$ The magnitude of the magnetic induction at a point $P$ at a distance $d$ from the point $O$ in a direction perpendicular to the plane $ABCD$ is

The magnetic induction at the point $O,$ if the wire carries a current $i,$ is

The figure below shows a current loop having two circular arcs joined by two radial lines. The magnetic field at $O$ is