Get Rewarded for Discussing Physics

Weekly Routine Maintenance is scheduled for every Sunday from 2100 Hrs to 2200 Hrs as per Indian Standard Time. The site may not be accessible during maintenance hours.
Why is the directio...
Clear all

Why is the direction of the magnetic field inside a bar magnet from S to N?


Topic starter

As a convention, the field lines due to a permanent bar magnet have a direction at any point outside the magnet along the direction that a tiny magnetic compass needle shows. Since like magnetic poles repel and opposite poles attract, the compass north, $N_{com}$ always stays in a direction away from the bar north, $N_{bar}$ as long as the compass is outside the bar magnet.

However, if we drill a longitudinal tunnel through the bar magnet and insert our tiny compass, then $N_{com}$ will be towards $N_{bar}$.


Refer to this figure:

This topic was modified 3 months ago 4 times by ThePhysicist