sometime t = 0, and a reduced current of 50 mu A at .at a time 100 ns later. (Yo

Question

sometime t = 0, and a reduced current of 50 mu A at .at a time 100 ns later. (You can choose to design two separate circuit if desired, and do not need to show initial capacitor voltage is set.) It is safe to assume that the switch drawn in the circuit of Fig. 8.58 has been closed such a long time that any transients which might have arisen from firs, connecting the voltage source have disappeared, Determine the circuit time constant. Calculate the voltage v(t) at t = tau, 2 tau, and 5 tau. We can safely assume the switch in the circuit of Fig. 8.59 was closed a very long time prior to being thrown open at t = 0. Determine the circuit time constant. Obtain an expression for i1(t) which is valid tor t > 0. Determine

Explanation / Answer

time constant = (150+100+200)*2n = 0.9us when switch was closed v= 4V when switch opens, capacitor acts as voltage source now v(t) = 4e^-t/0.9us v(t=0.9us) = 4e^-0.9us/0.9us = 1.47 V v(t=2*0.9us) = 0.54V v(t=5*0.9us) = 0.027V

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