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Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

At t = 0 , two identical capacitors A and B , each initially charged to a potential V , are connected in two separate circuits as illustrated in the figure. The respective charges on the capacitors at time t = CR are

Options

  1. AVC/e , VC/e
  2. BVC/e , VC
  3. CVC , VC/e
  4. DVC , VC

Correct answer

B. VC/e , VC

Step-by-step solution

In circuit (a), the positive plate of capacitor A is connected to the p-side (anode) of the diode, and the negative plate is connected to the n-side (cathode) through the resistor. This means the diode is forward-biased and acts as a closed switch, allowing current to flow. Capacitor A will discharge through the resistor R. The charge on the capacitor at any time t during discharging is given by the equation: q_A(t) = q₀ e^ - t RC Given the initial charge q₀ = CV and time t = CR , the charge on capacitor A is: q_A

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