Physics-Ampere's Law

NEET Physics Ampere's Law MCQ Question

Type: MCQ-numerical-Hard-Class 12

If a long straight wire carries a current I and the magnetic field at a distance r from the center of the wire is B, which of the following expressions correctly represents the magnetic field inside the wire (r < a) assuming a uniform current distribution?

A

B = (μ₀ I r) / (2π a²)

B

B = (μ₀ I a) / (2π r²)

C

B = (μ₀ I) / (2π r)

D

B = (μ₀ I) / (2π a)

Correct Answer

Option A

Detailed Explanation

According to Ampere's Law and considering a uniform current distribution inside the wire, the magnetic field B at a distance r < a is given by B = (μ₀ I r) / (2π a²).

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