A long solenoid of length 50 cm and 100 turns carries a current of 2.5 A. Calculate the magnetic field at its centre. Take μ₀ = 4π × 10⁻⁷ T·m/A.
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A long solenoid of length 50 cm and 100 turns carries a current of 2.5 A. Calculate the magnetic field at its centre. Take μ₀ = 4π × 10⁻⁷ T·m/A.

G1 Physics · Accepted Answer

Step 1: Long solenoid field B=μ₀(N/ℓ)I. Step 2: Given ℓ=0.50m,N=100,I=2.5A: n=100/0.50=200m⁻¹. Step 3: B=4π×10⁻⁷×200×2.5=6.28×10⁻⁴T. Answer D. Final answer: (D) 6.28 × 10⁻⁴ T.