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DC Motor

My question is that is my book it’s written that when the coil is in vertical position once it rotates the first time . There is no force acting on it and it’s balanced but when i search it up online they say that the coil does not stop abruptly and it’s moves because of inertia. and in book it’s written we can make it move continuously by changing the direction of current. But when i search it up online it’s written that the direction of current does not change only the side of the loop change.

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