Complete the diagram with commutator, etc. for the flow of current in the coil.

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Solution

The rectangular coil ABCD is placed in between the magnetic field and when current flows through the coil from the split ring commutator, a torque acts on the coil which rotates it continuously. To keep the torque from reversing every time the coil moves through the plane perpendicular to the magnetic field according to Fleming's right hand thumb rule, the split ring device is used to reverse the current at that point and maintain the direction of the current in the external circuit to flow in the same direction as DC current.
The diagram is given below.

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