Physics-Magnetic Force on Current
NEET Physics Magnetic Force on Current MCQ Question
Type: MCQ-numerical-Medium-Class 12
A long straight wire carries a current of 15 A. What is the magnitude of the magnetic field at a distance of 0.2 m from the wire?
A
1.5 × 10⁻⁶ T
B
3.0 × 10⁻⁶ T
C
7.5 × 10⁻⁶ T
D
9.0 × 10⁻⁶ T
Correct Answer
Option B
Detailed Explanation
Using the formula B = μ₀I/(2πR) where μ₀ = 4π × 10⁻⁷ Tm/A, I = 15 A, and R = 0.2 m, we compute B = (4π × 10⁻⁷ × 15) / (2π × 0.2) = 3.0 × 10⁻⁶ T.
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