6 Let Vab_c be the voltage when R21 is connected and Vab_d when RL21 is disconnected, find these peak voltages and current flow through R21. Express your result as IR21=900mA, Vab_c=5.3V, Vab_d=2.8V R20 6Q V6 8V a bl R21 3Ω R22 m 4Ω R23 20

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