A straight wire of diametre 0.5 mm carrying a current of 1 A is replaced by another wire of 1mm diametre carrying same current. The strenth of magnetic field far away isA. twice the earlier valueB. same as the earlier valueC. one-half of the earlier valueD. one-quarter of the earlier value

A straight wire of diametre 0.5 mm carrying a current of 1 A is replac

1.	A straight wire of diametre 0.5 mm carrying a current of 1 A is replaced by another wire of 1mm diametre carrying same current. The strenth of magnetic field far away isA. twice the earlier valueB. same as the earlier valueC. one-half of the earlier valueD. one-quarter of the earlier value
Answer» Correct Answer - b

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A straight wire of diametre 0.5 mm carrying a current of 1 A is replaced by another wire of 1mm diametre carrying same current. The strenth of magnetic field far away isA. twice the earlier valueB. same as the earlier valueC. one-half of the earlier valueD. one-quarter of the earlier value

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