At the below circuit i need to calculate the current Iab at 300 μs,can i apply voltage division to get the voltage across the appropriate resistors(30KΩ and 120KΩ)and by applying ohms law finding the currents and by using KCL at A find the Iab(t)?I am concerned as to if the use of voltage division is allowed across the 30KΩ and 120KΩ.

Capacitors initial voltage is 300V

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  • \$\begingroup\$ Yes , these are linear nodes A,B \$\endgroup\$ Jun 21 '20 at 13:39
  • \$\begingroup\$ Does the time constant change after switch closure? so consider this "non-linear response as piecewise linear in time. Req before vs after ? \$\endgroup\$ Jun 21 '20 at 13:43
  • \$\begingroup\$ Consider Thevenin Equiv. cct. How can it simplfy this? \$\endgroup\$ Jun 21 '20 at 13:53
  • \$\begingroup\$ Hi,thanks,it does not change this is from a linear circuit analysis course. \$\endgroup\$
    – Jmk
    Jun 21 '20 at 14:37
  • \$\begingroup\$ Good now Can U put your results in an answer in the form of an expression with time constants. \$\endgroup\$ Jun 21 '20 at 15:43

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