A tightly wound 100-turn coil of radius 10 cm carries 7 A. Find the magnitude of magnetic field at its centre. Take μ₀ = 4π × 10⁻⁷ T·m/A.
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A tightly wound 100-turn coil of radius 10 cm carries 7 A. Find the magnitude of magnetic field at its centre. Take μ₀ = 4π × 10⁻⁷ T·m/A.

G1 Physics · Accepted Answer

Step 1: Field at center of closely wound N-turn circular coil is B=μ₀NI/(2R). Step 2: Insert N=100, I=7A, R=0.10m and μ₀=4π×10⁻⁷. Step 3: B=[4π×10⁻⁷×100×7]/(2×0.10)≈4.4×10⁻³T=4.4mT. Answer B. Final answer: (B) 4.4 mT.