A long straight wire of radius carries a steady current I. The current is uniformly…
Physics · Class 12 · CBSE — Moving Charges and Magnetism
A long straight wire of radius carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B' at radial distances \(\frac{a}{2}\) and 2a respectively, from the axis of the wire is:
- 1
- \(\frac{1}{4}\)
- \(\frac{1}{2}\)
- 4
Answer
(A) 1
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