The armature of a three-phase alternator has 240 slots. The armature has 8 poles. Its distribution factor is _________.
1
\(\frac{10 \sin 15^\circ}{\sin 3^\circ}\)
2
\(\frac{\sin 30^\circ}{10 \sin 3^\circ}\)
3
\(\frac{\sin 3^\circ}{10 \sin 30^\circ}\)
4
\(\frac{\sin 15^\circ}{10 \sin 3^\circ}\)