Two sinusoidally distributed rotating fields are created

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Two sinusoidally distributed rotating fields are created by the startor and rotor of a cylindrical magnetic structure. Two fields having same number of poles are rotating in the same direction at the same speed. The interaction of these fields will produce a torque proportional to the sine of the angle between

1. either of the fields and the resultant field and acts in a direction to reduce this angle.
2. either of the fields and the resultant field and acts in a direction to increase this angle.
3. the rotor field (but not the startor field) and the resultant field and acts in a direction to reduce this angle.
4. the rotor field (but not the startor field) and the resultant field and acts in a direction to increase this angle.

Correct Option: A

NA