With standard notation, the armature torque of a DC motor is ________.

1
\({(\phi{I_a}PZ)}\over (2\pi A)\)
2
\({(\phi NPZ)}\over (2\pi A)\)
3
\({(\phi NPZ)}\over (60 A)\)
4
\({(\phi{I_a}PNZ)}\over (2\pi A)\)

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