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  4. A long cylindrical copper rod carries a direct current, the magnetic field associated with the rod will be :

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Q. A long cylindrical copper rod carries a direct current, the magnetic field associated with the rod will be :

Haryana PMTHaryana PMT 2002

Solution:

For solid rod ,there will be current flowing inside the rod , so there will be magnetic field (Ampere circuital law). There will magnetic field outside the rod and it will decrease as we increase the distance .