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 square loop of side a carris a current I . The magnetic field at the centre of the loop is

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 square loop of edge 'a' carries a current l. The magnetic field at the centre of loop is

A wire of length l carries a steady current. It is bent first to form a circular plane loop of one turn. The magnetic field at the centre of the loop is B. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same is

An infinite straigh conductor carrying current 2 I is split into a loop of radius r as shown in fig. the magnetic field at the centre of the coil is

Shown in the figure is a rectangular loop of conductor carrying a current i. The length and breath of the loop are respectively a and b. The magnetic field at the centre of loop is -

On meter length of wires carriers a constant current. The wire is bent to from a circular loop. The magnetic field at the centre of this loop is B . The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this loop B . The same is now bent to form a circular loop of smaller radius of have four turns in the loop. The magnetic field at the centre of this new loop is