Physics-Ampere's Law
NEET Physics Ampere's Law MCQ Question
Type: MCQ-diagram based-Medium-Class 12
In the description of Ampere's Law, consider an Amperian loop labeled 2, which is a circle concentric with the cross-section of a straight wire. What is the expression for the magnetic field B at a distance r from the center of the wire for the case when r < a, where 'a' is the radius of the wire?
A
B = (μ0 I r) / (2π a^2)
B
B = (μ0 I) / (2π r)
C
B = (μ0 I a) / (2π r^2)
D
B = (μ0 I r^2) / (2π a)
Correct Answer
Option A
Detailed Explanation
For r < a, the magnetic field inside the wire is given by B = (μ0 I r) / (2π a^2), as derived from Ampere's Law considering the uniform current distribution.
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