Physics-Magnetic Force on Current
NEET Physics Magnetic Force on Current MCQ Question
Type: MCQ-fact-Hard-Class 12
What is the formula to calculate the magnetic field B at a distance d from a long, straight conductor carrying a current I?
A
B = (μ₀/2π) * (I/d)
B
B = (μ₀/4π) * (I/d²)
C
B = (μ₀/2) * (I/d)
D
B = (μ₀/2π) * (I²/d)
Correct Answer
Option A
Detailed Explanation
The magnitude of the magnetic field at a distance R from a long, straight wire carrying a current I is given by B = (μ₀/2π) * (I/R), which aligns with option A when substituting R with d.
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