What occurs if armature reaction is not adequately corrected?

When armature reaction is not adequately corrected, it can lead to brushes arcing under certain load conditions. Armature reaction refers to the effect that the magnetic field created by the current-carrying armature conductors has on the overall magnetic field of the motor or generator. This interaction can distort the main magnetic field and produce a shift in the magnetic neutral axis, which can cause the brushes to make poor contact with the commutator.

This poor contact can lead to intermittent electrical connections, which may result in arcing—especially when the motor is under load. The arcing can further damage the brushes, commutator, and the overall efficiency of the electrical system. Proper compensation techniques, such as using interpoles or adjusting brush position, are essential to mitigate these effects and ensure smooth operation.

The other options relate to different effects that might occur under varying conditions of armature reaction but do not directly address the immediate and common issue of arcing due to ineffective correction of armature reaction.