Question

A Capacitor Is Approximately Fully Charged After? (a) two Time Constant (b) three Time Constant (C) four Time Constant (d) five Time Constant​

Answer 1

Answer:

d) Five Time Constant.

Explanation:

It takes about 15 seconds for the capacitor to charge.So for all practical purposes, after five time constants (5T) it reaches 99.3% charge, so at this point the capacitor is considered to be fully charged.When a capacitor is fully charged, no current flows in the circuit. This is because the potential difference across the capacitor is equal to the voltage source. (i.e), the charging current drops to zero, such that capacitor voltage = source voltage.