Question

Assertion: Charges are given to plates of two plane parallel plate capacitors $C_1$ and $C_2$ (such that $C_2=2C_1$)as shown in figure. Then the key $K$ is pressed to complete the circuit. Finally the net charge on upper plate and net charge the circuit. Finally the net charge on upper plate and net charge on lower plate of capacitor $C$ is positive.
Reason : In a parallel plate capacitor both plates always carry equal and opposite charge.

• A. If both Assertion arid Reason are correct and Reason is the correct explanation of Assertion.
• B. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
• C. If Assertion is correct but Reason is incorrect.
• D. If Assertion is incorrect but Reason is correct.

Answer 1

Answer: (D)

Since the magnetic field inside conducting plates must be 0, in a parallel plate capacitor, bot the plates must have equal and opposite charge. Hence, assertion is incorrect as charge on both the plates cannot be equal.