SampleExam1

# SampleExam1 - ECE 3070 Sample Exam#1 Problems 1 A magnetic...

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ECE 3070 Sample Exam #1 Problems 1. A magnetic circuit has the following dimensions: A = 16 cm 2 , length = 40 cm, and N = 360 turns. The relative permeability of the core is μ r = 50,000. For a magnetic flux density of 1.5 T in the core, determine, (a) The flux, ø. (0.0024 Wb) (b) The total flux linkage of the coil. (0.864 V•sec) (c) The required current in the coil. (0.026 A) 2. Consider the magnetic structure shown below. All dimensions are given in centimeters. The permeability of the core material can be considered to be infinity, i.e., μ r = 8. The stacking factor for the core is known to be 0.95. (a) Find the value of h required so that the magnetic flux is the same in both air gaps. (16.66 cm) (b) If h=20 cm, and the current in the coil is 20 Amps, find the energy stored in the magnetic field associated with the coil. (140 J) 10 125 15 10 35 10 h 12 15 50 5 Thickness = 8 cm. N= 1000

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SampleExam1 - ECE 3070 Sample Exam#1 Problems 1 A magnetic...

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