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2. The 2 – i relationship for an electromagnetic system is given by:
2 = 1.2
where g is the air gap length. For current i = 2 A and g = 10 cm, determine the mechanical force on the
moving part:
a) by using the energy of the system.
b) by using the co-energy of the system.
c) Comment on the results that you have found on part a and b. Discuss the choice of energy and co-
energy approaches.

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