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Statement of a problem № 3728

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In an R-C circuit the emf supplied by the battery is 120 V, R = 1x10^6 S and C = 10 nF. The switch S is closed at t = 0. Find (i) the time taken for the charge to reach 90% of its final value; (ii) the energy stored in the capacitor at one time constant; (iii) the Joule heating in the resistor at one time constant.

Solution:
In an R-C circuit the emf supplied by the battery is 120 V, R = 1x10^6 S and C =

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