NEET Physics Ampere's Law MCQ Question
Consider an Amperian loop which is a closed circular path of radius r centered on a long straight wire carrying a current I. According to Ampere's Law, which of the following correctly describes the relationship between the magnetic field B at a distance r from the wire and the current I for r > a, where a is the radius of the wire?
B is directly proportional to I and inversely proportional to r.
B is directly proportional to r and inversely proportional to I.
B is directly proportional to I and directly proportional to r.
B is inversely proportional to I and inversely proportional to r.
Correct Answer
Detailed Explanation
Ampere's Law states that for a long straight wire, B(2πr) = μ0I, which implies B is proportional to I/r for r > a.
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