NEET Physics Ampere's Law MCQ Question
A long straight wire carries a current I. If the magnetic field at a distance r from the center of the wire is B when r > a, where 'a' is the radius of the wire, what is the expression for the magnetic field at a distance r < a inside the wire?
B = (μ₀I/2πa²)r
B = (μ₀I/2π)r
B = (μ₀Ir/2πa)
B = (μ₀I/2πr²)a
Correct Answer
Detailed Explanation
Inside the wire (r < a), the magnetic field B is proportional to r, given by B = (μ₀Ir/2πa²), as derived from Ampere's Law considering the uniform distribution of current.
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