Final answer:
The direction of rotation for a split-phase motor is determined by looking along the motor shaft towards the motor's body, not by facing the back of the motor, making the given statement false. The right-hand rule is used to determine the direction of angular velocity and momentum in rotational systems. So, the correct option is B.
Step-by-step explanation:
The statement regarding the determination of the direction of rotation for a split-phase motor by facing the back or rear of the motor is false. In electrical engineering practices, the standard convention for determining the direction of motion, including the rotation of motors, is from the motor shaft's perspective, that is, looking along the shaft towards the body of the motor.
Regarding the other statements provided for context:
- The electric-field lines from a positive point charge do indeed spread out radially and point outward, making this statement true.
- Back EMF is an induced electromotive force that occurs in rotating coils within motors and acts to oppose the input EMF that powers the motor.
- When the number of coils in an electric motor is doubled, assuming all else remains equal, the torque provided by the motor would also be doubled, due to the increase in the magnetic field interactions within the motor.
Transformers can have varying numbers of primary and secondary turns, affecting their voltage transformation ratio.
Finally, the direction of angular velocity and angular momentum in rotational systems can be determined using the right-hand rule, which helps in understanding the behavior of rotating objects and the forces acting upon them.