Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Easy-Class 12
A long straight wire carries a steady current I. What is the magnetic field at a point P located at a distance r from the wire?
A
μ₀I / (2πr)
B
μ₀I / (4πr²)
C
μ₀I² / (2πr)
D
μ₀I / (πr)
Correct Answer
Option A
Detailed Explanation
The magnetic field due to a long straight current-carrying wire at a distance r is given by B = μ₀I / (2πr), which is consistent with the field being the same at every point on a circle of radius r around the wire.
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