A short bar magnet produces a magnetic induction of 4 x 10^-5 T at an axial point 10 cm from its center. It's dipole moment is (µ0= 4 x 10^-7 Wb / AM):
Correct answer: A. 0.2 Am2
- A. 0.2 Am2
- B. 2 x 10^-5 Am2
- C. 2 Am2
- D. None of these
Explanation
At an axial point B = μ₀ / 4π · 2M / r³∴ 4 × 10⁻⁵ = 10⁻⁷ × 2M / 0.001∴ M = 4 × 10⁻⁵ × 0.001 / 2 × 10⁻⁷= 0.2 A·m²
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