6. Determine the current I required to establish a flux of D 2 x 10 4 Wb in the

Question

6. Determine the current I required to establish a flux of D 2 x 10 4 Wb in the magnetic circuit in Fi 12.43. I, Sheet steel 0.002 m Ni 250 turns 0.3 A N2 500 turns Area (throughout) 1.3 x 10-4 m2 FIG. 12.43 Problem 16. 7. a. A flux of 0.2 x 10 4 Wb will establish sufficient attrac- tive force for the armature of the relay in Fig. 12.44 to close the contacts. Determine the required current to establish this flux level if we assume that the total mm drop is across the air gap b. The force exerted on the armature is determined by th equation B2A

Explanation / Answer

N1.I1-N2I2 is true because here mmf in both the winding are opposite in direction.

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