A long solenoid is formed by winding 70 turns cm⁻¹. If 2.0 A current flows, then the magnetic field produced inside the solenoid i $s ______________$ (μ₀ = 4π × 10⁻⁷ T m A⁻¹)
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A long solenoid is formed by winding 70 turns cm⁻¹. If 2.0 A current flows, then the magnetic field produced inside the solenoid i s ______________ (μ₀ = 4π × 10⁻⁷ T m A⁻¹)

G1 Physics · Accepted Answer

For a long solenoid, B = μ₀nI. Here n = 70 turns cm⁻¹ = 70 × 10² m⁻¹. Thus B = (4π × 10⁻⁷)(70 × 10²)(2) = 56π × 10⁻⁴ T ≈ 176 × 10⁻⁴ T.