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Unformatted text preview: Review Chapter 21 Electromagnetic radiation c=3.0x10 8 m/s E/B=c c=f 2 2 max max 2 2 o o B c E Power area c = = RLC circuits and resonance max 2 rms v v = max 2 rms I I = V IZ = ( 29 2 2 L C Z X X R = + 1 2 c X fC = 2 L X fL = transformer 1 1 2 2 V N V N = 1 1 2 2 I V I V = 18. An RLC circuit with R= 500 C= 4.4x106 F and L =0.4 H is in series with a 50 Hz generator and produces a rms current of 0.25 A. a) Find the required maximum voltage V. b) Find the phase shift between I and V. R L C 2 2 2 2 6 2 2 1 (2 ) 2 1 (2 (50)(0.4) ) 500 2 (50)(4.4 10 ) (126 723) 500 780 Z fL R fC Z x Z  = + = + = + = max max 2 rms V I Z I Z = = max 0.25(1.41)(780) 222 V V = = a) 18. An RLC circuit with R= 500 C= 4.4x106 F and L =0.4 H is in series with a 50 Hz generator and produces a rms current of 0.25 A. a) Find the required maximum voltage V. b) Find the phase shift between I and V. R L C 126 723 tan 1.19 500 50 L C o X X R = = =  =  b) X L X C R Z 40. A transformer has N 1 = 350 turns and N 2 =2000 turns. If the input voltage is V =170cos(t) what rms voltage is developed across the secondary? 1 1 2 2 V N V N = 1max 2 2 2 1 1 1 2 2 (170)(2000) 687 2(350) rms rms rms V N N V V N N V V = = = = Chapter 20 magnetic flux cos B BA = Faradays law B N t =  Lenzs law direction of current opposes motional emf =B v rotating coil sin NAB t = B I L t =  Inductors B N L I = 2 o N A L = l (for solenoid) PE=LI 2 L R = 6. A current of 10 A is flowing through a inductor L and resistor R and through a switch. If the switch is quickly opened, the voltage across the inductor __________....
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 Spring '07
 BRIANKEATING
 Power, Radiation

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