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Unformatted text preview: , L m1 = 263.9 mH, L l1 = 13.5 mH, r 2 ′ = 5 Ω , L l2 ′ = 13.5 mH. Compute the transient response of the transformer winding “1” current i 1 (t), assuming the windings are initially unexcited and winding “2” is opencircuited. a) When the switch is closed, the sinusoidal input voltage is at its maximum value. b) When the switch is closed, the input voltage is at its zero crossing point ( ϖ e = 377 rad/sec and V max = √ 2 ⋅ 110 volts). 4 5. Problem 5: Consider the elementary electromagnet shown below. Assume that the crosssectional area of the stationary and movable member is the same and A i = A g = 4 cm 2 . Assume l i = 20 cm, N = 500 turns, and μ ri = 1000. a) Derive an expression for the magnetizing inductance L m (x). b) Compute the value of the magnetizing inductance when x = 1mm. 5...
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 Spring '08
 Keyhani
 Electromagnet, Magnetic Field, Solenoid, Inductor, Relay

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