NEET Physics Ampere's Law MCQ Question
Using Ampere's Law, what is the expression for the magnetic field inside a long straight wire of radius 'a' carrying a uniform current 'I', at a distance 'r' from the center where r < a?
B = (μ₀Ir)/(2πa²)
B = (μ₀Ia)/(2πr²)
B = (μ₀I)/(2πr)
B = (μ₀Ir²)/(2πa)
Correct Answer
Detailed Explanation
For a point inside the wire (r < a), the magnetic field is given by B = (μ₀Ir)/(2πa²) as derived using Ampere's Law, considering the uniform current distribution.
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