Four long staight wires are located at the corners of a square `ABCD`. All the wires carry equal currents. Current in the wires `A` and `B` are inwards and in `C` and `D` are outwards. The magnetic field at the centre `O` is along

A current carrying wire AB of the length L is turned along a circle, as shown in figure. The magnetic field at the centre O.

A current carrying wire AB of the length L is turned along a circle, as shown in figure. The magnetic field at the centre O.

A current carrying wire AB of the length L is turned along a circle, as shown in figure. The magnetic field at the centre O.

A long wire carrying current 'I' is bent into the shape as shown in the figure. The net magnetic field intensity at the centre 'O' is

A long wire carrying current 'I' is bent into the shape as shown in the figure. The net magnetic field intensity at the centre 'O' 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

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

A square loop of wire of side a carries a current i . Calculate the magnetic field at the centre of the loop

Two long straight wires are connected by a circular section that has a radius r as shown in the figure . All segments of the wire lie in the same plane and carry steady current I . The magnetic field at centre O of the circular segment is

A wire is parallel to a square coil . The coil and wire carry currents in the directions Shown . Then, at any point A within the coil the magnetic field will be -