In Fig. the circular and the straight parts of the wire are made of same material but have different diameters. The magnetic field at the centre is zero.

The ratio of the diameters of wires of circular and straight parts is

In Fig. the circular and the straight parts of the wire are made of same material but have different diameters. The magnetic field at the centre is zero. Ratio of the currents I_1 andI_2 flowing through the circular and straight parts is

In Fig. the circular and the straight parts of the wire are made of same material but have different diameters. The magnetic field at the centre is zero. Ratio of the currents I_1 andI_2 flowing through the circular and straight parts is

Two wires of the same material but of different diameters carry the same current i . If the ratio of their diameters is 2:1 , then the corresponding ratio of their mean drift velocities will be

Two wires of the same material but of different diameters carry the same current i . If the ratio of their diameters is 2:1 , then the corresponding ratio of their mean drift velocities will be

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

The wire shown in figure carries a current of 40A. The radius of the circular part of the wire is 2 cm. Find the magnetic field at the centre of the circular part of the wire.