Write equation of magnetic field on axis from centre which have distance equal to radius.
Find out magnetic field at point $O$ ?
A regular polygon of $6$ sides is formed by bending
a wire of length $4 \pi$ meter. If an electric current of $4 \pi \sqrt{3} \mathrm{~A}$ is flowing through the sides of the polygon, the magnetic field at the centre of the polygon would be $x \times 10^{7} \mathrm{~T}$. The value of $\mathrm{x}$ is______.
The magnetic field intensity at the point $O$ of a loop with current $i$, whose shape is illustrated below is
The magnetic field at the origin due to the current flowing in the wire is -
Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways $P$, $Q$ and $R$ as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases