Two small magnets are placed horizontally perpendicular to magnetic meridian. Their north poles are at `30cm` east and `20cm` west from a compass needle. Compare the magnetic moments of the magnets, if compass needle remains undeflected.

A dip needle in a plane perpendicular to magnetic meridian will remain

A dip needle in a plane perpendicular to magnetic meridian will remain

A dip needle in a plane perpendicular to magnetic meridian will remain

How can a small compass needle be used to map the magnetic field due to a bar magnet?

Two short magnets with their axes horizontal and perpendicular to the magnetic maridian are palced with their centres 40 cm east and 50 cm west of magnetic needle.If the needle remains undeflected, the ratio of their magnetic moments M_(1):M_(2) is