The motor works because each part of the motor has specific function that causes spin. First, and electric current in a magnetic field will experience a force. In the current carrying wire the two sides are in a circular shape, each side is scraped and allows it to experience both positive and negative force of the magnetic field causing it to repel and spin. This is why each end is scraped differently. The two forces creates a torque to torque to rotate the coil. The coil contains several loops on an armature to provide a more uniform torque produced by the electric magnet. This motor could be used to preform simple tasks as in rotating a wheel or spinning a fan.
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