Question

What is the strength of the magnetic field around a thin, long straight conductor?

Answer 1

Step 1 : Magnetic field :

1. Magnetic field defined as the region around a magnetic material or a moving electric charge within which the force of magnetism acts is known as magnetic field.
2. It is a vector quantity.
3. Magnetic field is represented by magnetic field lines.
4. Magnetic field never cross each other.
5. Magnetic field don't start or stop anywhere, they always make closed loops and will continue inside a magnetic material.

Step 2 : An illustrative diagram of magnetic field :

Step 3 : Strength of magnetic field :

1. The magnetic field strength in a material arises from an external current.
2. It is also called magnetic intensity or magnetic field intensity.
3. The strength of the magnetic field around a thin, long straight conductor $B=\frac{{\mu }_0}{4\pi }\frac{2I}{a}$, Where $B$= Magnetic field intensity, $a$= distance from conductor, $I$ = current, ${\mu }_0$ = permeability.