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Two springs have one end fixed on opposite sides of the box; time to charge capacitor

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See attached file for diagram.

In the following circuit, what is the current through R1 at T=1 second after the switch is closed? How long does it take the capacitor to be 95% fully charged?

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Solution Summary

The solution shows the sequence of steps to solve the problem. The current through a closed switch is given.

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Effective resistance of the circuit:
R_eff = (2*6)/(2+6) = 1.5 M ohm
because charge in the capacitor at time t is given as:
q = Q * ( 1- e^(-t/t0))
where t0 = time constant of the circuit = R_eff * C =
= ...

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  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
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