Question

What is the role of the two conducting stationary brushes in a simple electric motor?

Answer 1

Hint: An electric powered motor is an electrical device that converts electrical energy into mechanical energy. The running precept of a motor is primarily based totally at the current-carrying conductor that reports a force while it is kept within the magnetic field. We use an electrical motor in our everyday life from driving a car to automatic opening of doors.

Complete answer:

The above is a basic diagram of an Electric motor, it consists of a magnet, battery, coil and two brushes. The air gap has magnetic field through these permanent magnets, but when we start supplying the current to the coil then the coil behaves as a magnet and it starts repelling from the magnetic field of permanent magnets and from this a torque is generated and it rotates the rectangular coil which is acting as a temporary magnet.
The two conducting motionless brushes take current from the battery and pass it to the armature of the motor because as it touches the outer sides of the two halves of the split rings, the internal sides of split rings are Insulated and connected to the axle of the motor.
Hence according to the question, we have been asked about the role of the brushes
So, we can say that the only role of the brushes is to pass the current.

Note:
We cannot use any normal connectors instead of brushes because the rectangular coil is rotation at a very high speed and if we connect the wire or clip directly the rotatory force will break the connections and hence, we need to use the brush or slip rings, these brushes do not rotate with the coil and they are fixed at their location.