Magnetic field at point $'M'$ of given current distribution
$\frac{{2{\mu _0}}}{\pi } \odot $
$\frac{{5{\mu _0}}}{{2\pi }} \otimes $
$\frac{{2{\mu _0}}}{{\pi }} \otimes $
$\frac{{{\mu _0}}}{{2\pi }} \otimes $
In the diagram, $I_1$ , $I_2$ are the strength of the currents in the loop and infinite long straight conductor respectively. $OA = AB = R$ . The net magnetic field at the centre $O$ is zero. Then the ratio of the currents in the loop and the straight conductor is
Field at the centre of a circular coil of radius $r$, through which a current $I$ flows is
Two infinitely long wires each carrying current $I$ along the same direction are made into the geometry as shown in the figure below. The magnetic field at the point $P$ is
The following statement is false for Helmholtz coils