A straight magnetic strip has a magnetic moment of $44 \mathrm{Am}^2$. If the strip is bent in a semicircular shape, its magnetic moment will be .. . . . . . .$\mathrm{Am}^2$ $\left(\right.$ Given $\left.\pi=\frac{22}{7}\right)$

Magnetic lines of force due to a bar magnet do not intersect because

A magnetic needle of negligible breadth and thickness compared to its length, oscillates in a horizontal plane with a period $T$. The period of oscillation of each part obtained on breaking the magnet into $n$ equal parts perpendicular to the length is

The earth’s magnetic field at the equator is approximately $0.4 \;G$. Estimate the earth’s dipole moment.

A long magnet is cut in two parts in such a way that the ratio of their lengths is $ 2 : 1. $ The ratio of pole strengths of both the section is

Two small bar magnets are placed in a line with like poles facing each other at a certain distance $d$  apart. If the length of each magnet is negligible as compared to $ d,$  the force between them will be inversely proportional to