A long straight wire of radius (a) carries a steady current ( I ). The current is…
Physics · NEET · NTA Exams — Magnetic Effects of Current and Magnetism
A long straight wire of radius (a) carries a steady current (\(\text { I }\)). The current is uniformly distributed across its cross section. The ratio of the magnetic fields at (a/2) and (2a) is
- \(\frac{1}{4}\)
- 4
- 1
- \(\frac{1}{2}\)
Answer
(C) 1
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