Evaluate the line integral over the given curve C. 
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Definitions:
Shunt Field
A winding in electrical generators or motors that is connected parallel to the armature, influencing the magnetic field.
Armature
The rotating part of an electric machine, such as a motor or generator, within which voltage is induced by magnetic action.
Magnetic Field
A region around a magnetic material or a moving electric charge within which the force of magnetism acts.
DC Machine
An electrical machine that operates on direct current (DC) and includes both motors and generators.
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