NEET2026Physics-Magnetism
NEET 2026 Physics Magnetic Field due to Current MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The figure given below shows a long straight solid wire of circular cross-section of radius 'a' carrying steady current I. The current I is uniformly distributed across its cross-section. The plot which correctly represents the variation of magnetic field (B) with distance (r) from the axis of the conductor in the region is:
Correct Answer
Option A
Detailed Explanation
For a long straight solid wire carrying steady current, which is uniformly distributed across its cross-section, the variation of magnetic field (B) with distance (r) from axis will be B = (μ₀Ir)/(2πa²) for r < a, indicating B ∝ r. For r > a, B = (μ₀I)/(2πr), indicating B ∝ 1/r.
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