A 3-T armature is physically justified to be better than a 2-T armature in an electric motor because it provides a more balanced distribution of magnetic forces, resulting in smoother operation and reduced vibrations. The additional tooth in the 3-T armature allows for more efficient power transfer and higher torque output. This design also helps to minimize cogging torque, leading to improved overall performance and efficiency of the electric motor. **

The armature of an electric motor spins because of the interaction between the magnetic field and the electric current. When an electric current is passed through the armature, it creates a magnetic field around it. This magnetic field interacts with the magnetic field produced by the stator, causing the armature to spin. This spinning motion is what drives the motor and allows it to perform mechanical work. **

No, the rotor and the armature are not the same thing. The rotor is the rotating part of an electrical machine, such as a motor or generator, while the armature is the stationary part that contains the coils of wire. In a motor, the rotor is the part that spins to generate motion, while the armature provides the magnetic field that interacts with the rotor to produce the desired movement. In a generator, the roles are reversed, with the armature spinning to generate electricity and the rotor providing the magnetic field. **

The electric motor cannot start at any position of the armature because it relies on the interaction between the magnetic field and the current flowing through the armature to generate torque. If the armature is not in the correct position relative to the magnetic field when power is applied, the motor will not have the necessary starting torque to overcome inertia and begin rotating. Therefore, the motor needs to be in a specific position to ensure that the magnetic field and current are aligned properly for efficient operation. **

A permanent rotation of the armature in an electric motor occurs due to the interaction between the magnetic field produced by the stator and the magnetic field generated by the current flowing through the armature windings. When an electric current is passed through the armature windings, it creates a magnetic field that interacts with the magnetic field of the stator, resulting in a force that causes the armature to rotate. This continuous interaction between the magnetic fields of the stator and armature leads to a permanent rotation of the armature, which drives the motor. **

The electric motor cannot start at every starting position of the armature because the armature needs to be in a specific position relative to the magnetic field for the motor to start efficiently. This position is known as the 'synchronous position' where the armature's magnetic field is aligned with the stator's magnetic field. Starting the motor from any other position may result in inefficient operation, increased power consumption, or even failure to start altogether. Therefore, the motor is designed to start from a specific starting position to ensure optimal performance. **

In an electric motor, a continuous rotation of the armature is achieved through the interaction of magnetic fields. When an electric current is passed through the armature, it creates a magnetic field that interacts with the fixed magnetic field produced by the stator. This interaction causes a torque to be exerted on the armature, resulting in its rotation. By continuously switching the direction of the current flow in the armature, the magnetic fields interact in a way that keeps the armature rotating in the desired direction. **

The electric motor doesn't turn on in every position of the armature because the armature needs to be in a specific position in relation to the magnetic field in order for the motor to start. This is known as the commutation process, where the direction of the current in the armature windings needs to be switched at the right time to keep the motor turning. If the armature is not in the correct position, the commutation process will not occur and the motor will not start. Therefore, the motor only turns on when the armature is in the correct position for commutation to take place. **