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why a magnetic field is produced when electricity passes through a wire????

why a magnetic field is produced when electricity passes through a wire????
 

Grade:10

1 Answers

Ashish Gupta IIT Roorkee
askIITians Faculty 12 Points
9 years ago
The electric and magnetic fields are reference frame dependent and thus intertwined and hence one speaks ofelectromagneticfields. Special relativity provides the transformation rules for how an electromagnetic field in one inertial frame appears in another inertial frame.
The transformation of theelectric fieldof a moving charge into a non-moving observer's reference frame results in the appearance of a magnetic field. Conversely, themagneticfield generated by a moving charge disappears and becomes a purelyelectrostaticfield in a co-moving frame of reference.

And hence we can say that both Electric & Magnetic fields areinter-dependent(i.e.) One field requires another (or) one field produces another. The phenomenon is calledElectromagnetism. An electric charge at rest (static), produces an electric field. But when the charge is in motion (current), a magnetic field is produced perpendicular to its direction of propagation.

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