회전력(Torque, \(\tau\)) 계산 :
\[
\tau = m \cdot B \cdot \sin(\theta)
\]
먼저 자기 모멘트 \(m\)을 계산합니다:
\[
m = p \cdot l = 7.4 \times 10^{-5} \, \text{Wb} \times 0.1 \, \text{m} = 7.4 \times 10^{-6} \, \text{Wb} \cdot \text{m}
\]
이제 회전력을 계산합니다:
\[
\tau = m \cdot B \cdot \sin(\theta) = 7.4 \times 10^{-6} \, \text{Wb} \cdot \text{m} \times 100 \, \text{AT/m} \times \sin(30°)
\]
\(\sin(30°) = 0.5\)이므로:
\[
\tau = 7.4 \times 10^{-6} \, \text{Wb} \cdot \text{m} \times 100 \, \text{AT/m} \times 0.5 = 3.7 \times 10^{-4} \, \text{N} \cdot \text{m}
\]

따라서, 회전력은 \(3.7 \times 10^{-4} \, \text{N} \cdot \text{m}\)입니다.