A long straight wire of radius a carries a steady current I . The current is uniformly…
Physics · Class 12 · CBSE — Moving Charges and Magnetism
A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its area of cross-section. The ratio of magnitude of magnetic field \(\vec{B}_1\) at \(\dfrac{a}{2}\) and \(\vec{B}_2\) at distance 2a is
- \(\frac{1}{2}\)
- 1
- 2
- 4
Answer
(B) 1
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