0- Magnetic Field: The magnetic field is the area around a magnet where its influence affects other magnetic materials. It is measured in Teslas (T).
- Magnetic Field Lines: These lines extend from the north pole of a magnet, curve around, and return to the south pole forming closed loops. They are densest near the poles and never intersect. The direction of the magnetic field at any point is indicated by the tangent to the field lines at that point.
- When an electric current transfers through a straight conductor, it generates a magnetic field around it, which is invisible but can be detected with a magnetic compass. Increasing the current causes greater deflection of the compass needle. The magnetic field lines form concentric circles centred on the wire and lie in a plane perpendicular to its length. The field strength is stronger near the conductor and weakens with distance from it.
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The Right-Hand Thumb Rule identifies the direction of the magnetic field around a current-carrying conductor. To use it:
- Hold the wire with your right hand.
- Point your thumb in the direction of the current.
- Your curled fingers show the direction of the magnetic field lines, which form concentric circles around the wire.
