Filter Courses

Magnetic Field due to Straight Current carrying Conductor

Magnetic Field due to Straight Current carrying Conductor in Grade 12 Physics

Magnetic Field due to Straight Current carrying Conductor

Magnetic Field due to Straight Current carrying Conductor

Figure (a) and (b): The diagrams show the magnetic field pattern around a straight conductor carrying current.

The Magnetic field lines around a straight conductor carrying current are concentric circles whose centres lie on the wire. The direction of magnetic field lines can be determined using the Right-Hand Thumb Rule.

Factors affecting the strength of the magnetic field are:
1. Magnetic field strength is directly proportional to the magnitude of the current flowing in the conductor. i.e. B∝I, greater the current in the conductor, stronger will be the magnetic field produced.

2. Magnetic field strength is inversely proportional to the distance from the wire i.e. B∝1r, greater the distance from the current-carrying conductor, weaker will be the magnetic field.

Consider an infinitely long conductor AB through which current I flow. Let P be any point at a distance from the centre of the conductor. Consider dl to be the small current-carrying element at point c at a distance r from point p. α be the angle between r and dl. l be the distance between the centre of the coil and elementary length dl.
From biot-savant law, magnetic field due to current carrying element dl at point P is

 

Menu