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BITSAT2019PhysicsCapacitanceActual

When a capacitor is fully charged as shown in the following figure, then current drawn from the cell is

Options

  1. A1   mA
  2. B0 . 5   mA
  3. C2   mA
  4. D5   mA

Correct answer

B. 0 . 5   mA

Step-by-step solution

When capacitor is fully charged, then it acts like a open switch, therefore 8   kΩ resistor has no use. So, rest of the resistances 4   kΩ ,   7   kΩ and 9   kΩ will be in series. Hence, current drawn from cell I = 10 4 + 7 + 9 × 10 3 = 10 20 × 10 3 = 0 . 5   mA

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