RE-NEET2026Physics-Electromagnetism
RE-NEET 2026 Physics Magnetic Field MCQ Question
Type: MCQ-numerical-Medium-Class 12
A current I₀ flows through a metallic circular loop of radius r as shown in the figure. Resistance of the segment ABC is half that of ADC. Magnitude of magnetic field at the center O of the loop is:
A
μ₀I₀/4r
B
μ₀I₀/2r
C
μ₀I₀/2πr
D
μ₀I₀/12r
Correct Answer
Option A
Detailed Explanation
Using Ampere's law and symmetry, the magnetic field at the center due to the loop is μ₀I₀/4r.
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