NEET Physics Ampere's Law MCQ Question
A long straight wire carries a current I and has a uniform current distribution. Using Ampere's Law, what is the magnetic field B at a distance r from the center of the wire, where r < a (a is the radius of the wire)?
B = (μ₀I/2πa²)r
B = (μ₀I/2πr)
B = (μ₀Ir/2πa)
B = (μ₀Ia/2πr)
Correct Answer
Detailed Explanation
According to Ampere's Law, the magnetic field inside the wire (r < a) is B = (μ₀Ir)/(2πa²), as the current enclosed is less than the total current I due to uniform distribution.
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