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The Attempt at a Solution
so here are my answers, i just want to know if they are correct.
also, im really confused about the function of the commutator in the DC motor, the answer i wrote for part b) was based on research off random websites that didnt really make sense, i dont actually understand how a commutator functions and its purpose, can someone please explain in simple terms.
thanks for the help!
a) the answer is Clockwise,
i used the right-hand rule for the motor principle to figure out the direction of the magnetic force acting on the conductor. As shown below:
A commutator is a common part of most direct current-rotating machines. The commutator functions by reversing the direction of the current in the coil, in order to produce a steady rotating force. Together with the carbon brushes, the commutator ensures that the current flowing through the coil is in the same direction as the magnetic field, so the motor will rotate continuously.
c) The Carbon brushes that are pressed against each side of the commutator are there to conduct the current throughout the motor. The main function of carbon brushes is to deliver or collect current from the rotating part of the electric motor. These brushes are pressed against the commutator, but not firmly attached to it, so when the commutator and coil begin to rotate, the brushes remain stationary, while still conducting electricity throughout the circuit.
c) The whole concept of the DC motor is based on the idea that whenever a current carrying conductor (such as a coil) is placed within an external magnetic field, it will experience a mechanical force. How is this ‘external’ magnetic field established? This is where permanent magnets come into play. The permanent magnets simply create an external magnetic field that the coil’s magnetic field can interact with, resulting in a force that ultimately causes the conductor (in this case, the coil) to rotate.