When an electric current passes through a straight wire, it is surrounded by a/ an
Correct answer: B. magnetic field.
- A. electric field.
- B. magnetic field.
- C. conservative field.
- D. gravitational field.
Explanation
When an electric current passes through a straight wire, it generates a magnetic field around it. This is because the moving electric charges create a magnetic field in the surrounding space, as described by Ampere's law. While electric fields are associated with stationary charges, magnetic fields are generated by moving charges, making option B, 'magnetic field,' the correct answer. Option A, 'electric field,' is incorrect as electric fields are typically produced by stationary charges. Option C, 'conservative field,' is incorrect as conservative fields are related to work done in moving a charge between two points and are not directly tied to the presence of an electric current. Option D, 'gravitational field,' is unrelated to the behavior of electric currents in wires.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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