the figure. The potential difference across the capacitor is observed with the help of a voltmeter whose internal resistance is Riç = 12 MΩ.  if the values of the resistor and capacitor are R=4 MΩ and C=20µF, respectively,  a)Calculate the time constant (τ) of this RC circuit by including the internal resistance of voltmeter.  b) Calculate the time constant (τ) of this RC circuit by not including  the internal resistance of voltmeter.  c) What is the difference in your results of a) and b)?  Explain the difference with its reason

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A: The time constant of the circuit is τ=RC=1.9×106 Ω3.4×10-6F=6.46 s

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