Equal current of $4 \mathrm{A}$ is flowing in two parallel conductors kept at a distance of $2 \mathrm{m}$ in mutually opposite directions, as shown in the figure. The magnetic conduction (in $\mathrm{\mu T}$) at a point $P$, equidistant from both the conductors at a distance $2 \mathrm{m}$, will be

The conductor $ABCDEF$ carries a current of $4 \mathrm{A}$. Find the net magnetic field at the Centre $O$.

$PQRS$ is a square loop made of a uniform conducting wire. The current enters the loop at $P$, and leaves at $S$. Then the magnetic field will be

The magnetic field at centre $O$ for the following current distribution is 

Here, $I$ is the current is wire and ${\mu }_0$ is the permeability of free space.

A current $i$ is flowing in a conductor-shaped wire, as shown in the figure. The radius of the curved part is $r$ and length of straight portions is very large. The value of the magnetic field at the centre $O$ will be

Electric currents $i_1$ and $i_2$ are flowing in two mutually perpendicular conductors, as shown in the figure. The equation of locus of zero magnetic field points will be

The intensity of the magnetic field at a point situated at a distance $r$ close to a long straight current-carrying wire is $B$. The intensity of field at a distance $\frac{r}{2}$ from the wire will be

Any two points of a circular conducting wire are connected with a coil in such a way that length of one part is $L_1$ and that of other part is $L_2$_. Then the resultant magnetic induction at the centre will be