A part of a long wire carrying a current `i` is bent into a circle of radius `r` as shown in figure. The net magnetic field at the centre `O` of the circular loop 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

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 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

A long straight conductor carrying a current i is bent to form an almost complete circular loop of radius r on it. The magnetic field at the centre of the loop

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

An infinite straight current carrying conductor is bent into a circle as shown in the figure . If the radius of the circle is R , the magnetic field at the centre of the coil is :