Question

Q2. While rotating the coil comes in a vertical position the contact of Commutator and brushes breaks, but
the coil still continues to rotate. Why?​

Answer 1

Answer:

Once the coil gets to the upright position, there is no turning force on it because the electromagnet of the coil is lined up with the permanent magnets. If the current in the coil were constant, the coil would stop in this position. However, to keep it spinning, the commutator breaks contact in this position

Explanation:

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Answer 2

While rotating when the coil reaches vertical position then the brushes touch the gap between the commutator rings and current to the coil is cut off. But the coil does not stop rotating because it has already gained momentum.

While rotating when the coil reaches vertical position then the brushes touch the gap between the commutator rings and current to the coil is cut off. But the coil does not stop rotating because it has already gained momentum.As it rotates, due to the action of brushes again, the current gets reversed.

While rotating when the coil reaches vertical position then the brushes touch the gap between the commutator rings and current to the coil is cut off. But the coil does not stop rotating because it has already gained momentum.As it rotates, due to the action of brushes again, the current gets reversed.The reversing of current in the coil is repeated after every half rotation due to which the coil continue to rotate as long as current from the battery is passed through it.