STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Field of a Wire MCQ Question
Type: MCQ-conceptual-Medium
The correct plot of the magnitude of magnetic field B vs distance r from centre of the wire is, if the radius of wire is R
A
(1)
B
(2)
C
(3)
D
(4)
Correct Answer
Option B
Detailed Explanation
The magnetic field from the centre of a wire of radius R is given by B = (μ₀I/2R)r for r < R, which implies B ∝ r, and B ∝ 1/r for r > R. This description matches graph (b).
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