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Concepts Of Physics MCQ Edition [Volume 2]PhysicsCapacitors

Suppose each plate of a parallel plate capacitor carries a charge q . The capacitor is subsequently connected to a battery. Following this connection,

Options

  1. Athe battery delivers equal and opposite charges to the two plates
  2. Bthe facing surfaces of the capacitor carry equal and opposite charges
  3. Cthe two plates of the capacitor carry equal and opposite charges
  4. Dthe outer surfaces of the plates carry equal charges

Correct answer

D. the outer surfaces of the plates carry equal charges

Step-by-step solution

Let the initial charge on each plate of the capacitor be q . When a battery is connected across the capacitor, it transfers charge from one plate to the other. If the battery transfers a charge Q , it delivers +Q to one plate and -Q to the other. Thus, the battery delivers equal and opposite charges to the two plates. The final charges on the two plates become q₁ = q + Q and q₂ = q - Q . Since q 0 , the total charges on the two plates are not equal and opposite. The charge on the outer surfaces of the plates is alw

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