Medium MCQ +4 / -1 PYQ · JEE Mains 2022

A capacitor is discharging through a resistor R. Consider in time t1, the energy stored in the capacitor reduces to half of its initial value and in time t2, the charge stored reduces to one eighth of its initial value. The ratio t1/t2 will be

  1. A 1/2
  2. B 1/3
  3. C 1/4
  4. D 1/6 Correct answer

Solution

<p>For a discharging capacitor when energy reduces to half the charge would become ${1 \over {\sqrt 2 }}$ times the initial value.</p> <p>$\Rightarrow {\left( {{1 \over 2}} \right)^{1/2}} = {e^{ - {t_1}/\tau }}$</p> <p>Similarly, ${\left( {{1 \over 2}} \right)^3} = {e^{ - {t_2}/\tau }}$</p> <p>$\Rightarrow {{{t_1}} \over {{t_2}}} = {1 \over 6}$</p>

About this question

Subject: Physics · Chapter: Electrostatics · Topic: Electric Potential and Capacitance

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