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Question:

Find the voltage drop across a capacitor connected with a resistance and battery of 60V in series after a long time.

38 V

30 V

0 V

60 V

Solution:

In a RC-series circuit excited by a DC source, at steady state, no current flows. So, all the voltage drop is across the capacitor. Therefore, the voltage drop will be 60 V. The formula is V = V0(1−e−t/RC).