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- Induksi magnetik
i₁ = 20 A a₁ = 2×10⁻² m
i₂ = 20 A a₂ = 6×10⁻² m
B = __ ?
Induksi magnetik oleh i₁ berarah ke dalam
Induksi magnetik oleh i₂ berarah ke luar
Resultan B₁ dab B₂
B = B₁ + B₂
= μ₀ i₁ / (2π a₁) - μ₀ i₂ / (2π a₂)
= μ₀ i/ 2π (1 / a₁ - 1 / a₂)
= 4π×10⁻⁷ · 20 / 2π (1 / 2×10⁻² - 1 / 6×10⁻²)
= 2×10⁻⁷ ·20 (50 - 100/6)
= 2×10⁻⁷ · 20 · 200/6
= ⁴/₃×10⁻⁴ = 1,3×10⁻⁴ T
=0,13 mT, masuk bidang kertas ← jawaban [B]