NEET Physics Ampere's Law MCQ Question
Using Ampere's Circuital Law, what is the magnetic field B at a distance r = 3 cm from the center of a long straight wire carrying a current I = 5 A, when r > a where a is the radius of the wire?
B = μ0 * I / (2π * r)
B = μ0 * I * r / (2π * a^2)
B = μ0 * I * a^2 / (2π * r^2)
B = μ0 * I * a / (2π * r)
Correct Answer
Detailed Explanation
For r > a, the magnetic field due to a long straight wire is given by B = μ0 * I / (2π * r) as per Ampere's Circuital Law.
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