Physics-Ampere's Law
NEET Physics Ampere's Law MCQ Question
Type: MCQ-numerical-Easy-Class 12
For a long straight wire carrying a uniform current I, what is the magnetic field B at a distance r from the center of the wire, where r > a?
A
μ₀I / (2πr)
B
μ₀I / (4πr)
C
μ₀I / (2πa)
D
μ₀I / (πr)
Correct Answer
Option A
Detailed Explanation
Ampere's Law states that for a long straight wire with uniform current distribution, the magnetic field B at a distance r from the wire, where r > a, is given by B = μ₀I / (2πr).
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