NEET · Physics · STD 12 - 4. Moving charges and magnetism
From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is :
- A a linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.
- B a linearly increasing function of distance \(r\) upto the boundary of the wire and then decreasing one with \(1 / r\) dependence for the outside region.
- C a linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.
- D uniform and remains constant for both the regions.
Answer & Solution
Correct Answer
(B) a linearly increasing function of distance \(r\) upto the boundary of the wire and then decreasing one with \(1 / r\) dependence for the outside region.
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