A coil of wire is carrying an electric current. How will the magnetic field of the coil be affected if an iron rod is placed in its center ?A The field will be cancelled out. B The strength of the field will increase. C The strength of the field will decrease. D The direction of the field will reverse.
Question
A coil of wire is carrying an electric current. How will the magnetic field of the coil be affected if an iron rod is placed in its center ?A The field will be cancelled out. B The strength of the field will increase. C The strength of the field will decrease. D The direction of the field will reverse.
Solution
B. The strength of the field will increase.
When an iron rod is placed in the center of a coil carrying an electric current, it acts as a magnetic core and concentrates the magnetic field lines. This results in an increase in the strength of the magnetic field. This is because iron is a ferromagnetic material, which has the ability to enhance the magnetic field in its vicinity.
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