A straight wire of diameter 0.5 mm carrying a current of 1A is replaced by another wire of diameter 1 mm carrying the same current. The strength of magnetic field far away is:
Text Solution
Verified by ExpertsThe correct answer is:
D
For external points the current carrying wire behaves as if the whole current were concentrated at the axis, so magnetic field at far points from axis B = 
remains unaffected if diameter of wire is changed.
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