Alternating Current Ques 28

28. The time constant of $C-R$ circuit is

(a) $1 / CR$

(b) $C / R$

(c) $CR$

(d) $R / C$

Show Answer

Answer:

Correct Answer: 28.(c)

Solution:

  1. (c) The time constant for resonance circuit, $=CR$

Growth of charge in a circuit containing capacitance and resistance is given by the formula,

$q=q_0(1-e^{-t / C R})$

$CR$ is known as time constant in this formula.



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