In a dc series motor. Assume negligible armature circuit

In a dc series motor. Assume negligible armature circuit resistance; the magnetic circuit is linear

1. the speed varies inversely as the square root of the load torque; at a given torque load speed is directly proportional to the number of field turns.
2. the speed varies inversely as the square of the load torque; at a given torque load speed is directly proportional to the number of field turns.
3. the speed varies inversely as the load torque; at a given torque load speed is inver sely proportional to the number of field turns.
4. the speed varies inversely as the square root of the load torque; at a given torque load speed is inversely proportional to the number of field turns.