Moving Charges and Magnetism

Question: A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is



1) Twice the earlier value
2) Half of the earlier value
3) Quarter of its earlier value
4) Unchanged
Solution: Explanation: No Explanation
Biot-Savart's Law Amperes Law

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