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- 1(current)
Q. No.A long straight wire of radius a 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. | \(\dfrac{1}{2}\) | 2. | \(1\) |
| 3. | \(4\) | 4. | \(\dfrac{1}{4}\) |
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Subtopic: Â Ampere Circuital Law |
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