What quantities do you know? You have to assume/measure something to infer the current....it is possible to know the current flowing through conductor without practically measuring.
A magnetic field is an invisible force created by moving electric charges, such as electrons. It is a vector quantity, meaning it has both magnitude and direction. Magnetic fields are present around objects that have a magnetic property, such as a magnet or a current-carrying wire.
A magnetic field can exert a force on objects that have a magnetic property. This force can cause objects to move, align in a certain direction, or induce an electric current. The strength of the force depends on the strength of the magnetic field and the properties of the object.
Skin effect is a phenomenon that occurs when an alternating current (AC) flows through a conductor. As the frequency of the AC increases, the current tends to flow near the surface of the conductor, rather than through the entire cross-section. This is due to the resistance of the material and the self-inductance of the current, resulting in a higher resistance and reduced current flow in the center of the conductor.
Skin effect can cause an increase in the effective resistance of a conductor, leading to a higher power loss. This can result in decreased efficiency and increased heating in electrical systems. Skin effect is also a concern in high-frequency applications, as it can cause signal distortion and reduced transmission efficiency.
Skin effect can be minimized by using conductors with larger cross-sections, as this reduces the resistance and allows for more current to flow through the center of the conductor. It can also be controlled by using specialized designs, such as hollow or stranded conductors, or by using materials with lower resistivity. For high-frequency applications, skin effect can be reduced by using techniques such as litz wire, which consists of multiple small insulated wires woven together to reduce the effective resistance.