Two long straight wires are connected by a circular section which has a radius `R`. All the three segments lie in the same plane and carry a current `I`. The magnetic induction at the centre `O` of the circular segments is

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 circular coil of wire of radius 'r' has 'n' turns and carries a current 'I'. The magnetic induction (B) at a point on the axis of the coil at a distance sqrt3r from its centre is

A conducting wire carrying a current I is bent into the shape as shown. The net magnetic field at the centre O of the circular arc of radius R

A conducting wire carrying a current I is bent into the shape as shown. The net magnetic field at the centre O of the circular arc of radius R