NEET Physics Ampere's Law MCQ Question
If a long straight wire carries a current I and the magnetic field at a distance r from the center of the wire is B, which of the following expressions correctly represents the magnetic field inside the wire (r < a) assuming a uniform current distribution?
B = (μ₀ I r) / (2π a²)
B = (μ₀ I a) / (2π r²)
B = (μ₀ I) / (2π r)
B = (μ₀ I) / (2π a)
Correct Answer
Detailed Explanation
According to Ampere's Law and considering a uniform current distribution inside the wire, the magnetic field B at a distance r < a is given by B = (μ₀ I r) / (2π a²).
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